CN106029404B

CN106029404B - Pneumatic tire

Info

Publication number: CN106029404B
Application number: CN201580010688.4A
Authority: CN
Inventors: 宗泽吾郎; 高田匠; 光冈昌典; 小木曾敬纪
Original assignee: Sumitomo Rubber Industries Ltd
Current assignee: Sumitomo Rubber Industries Ltd
Priority date: 2014-02-26
Filing date: 2015-02-23
Publication date: 2018-09-14
Anticipated expiration: 2035-02-23
Also published as: EP3112189A4; EP3112189B1; US10513154B2; WO2015129595A1; US20170072750A1; CN106029404A; EP3112189A1

Abstract

[problem] in order to provide can improve quietness and durability without reduce steering stability tire (2).[scheme] tire (2) is equipped with：A pair of bead (12)；Carcass (14), the carcass is across between the two tyre beads (12)；And a pair of of band (24), the band extend outwardly along carcass (14) from tyre bead (12) substantially in radial directions.Tyre bead (12) is equipped with core (34), the first apex strip (36) and the second apex strip (38).Carcass (14) is equipped with casingply (44), and major part (46) and folded portion (48) are formed in casingply (44).Folded portion (48) is located between the first apex strip (36) and the second apex strip (38).Folded portion (48) is in outer end (42) more radial outside contact major part (46) than the first apex strip (36).The position of the outer end (64) of band (24) is overlapped with the position (PB) of maximum width is indicated in radial directions, or the outer end (64) of band (24) is located in more radially inner side than the position (PB) of expression maximum width.

Description

Pneumatic tire

Technical field

The present invention relates to pneumatic tires.More particularly, the present invention relate to the pneumatic tires of passenger car.

Background technology

Tire includes a pair of bead.Carcass extends on the tyre bead of both sides and between the tyre bead.

Each tyre bead includes core and apex strip.Apex strip extends outwardly from core in radial directions.Apex strip is by height The crosslinking rubber of hardness is formed, and the usually length with about 35mm.

The carcass of tire is formed by digging casingply around core.Therefore, casingply includes：Main portion Point, which extends from equatorial plane towards each core；And part is dug, this digs part each along apex strip from core It extends radially outwards.

In tire, bead part is cooperated in wheel rim.Under operation, bead part is under heavy duty.Therefore, Durability in bead part is important.Various researchs have been carried out for the durability in bead part.In JP2005- The embodiment of research is disclosed in 255047.

As described above, under operation, bead part is under heavy duty.Therefore, the rigidity of bead part is important 's.

It structure for arrangement bead part and controls the rigidity of this part and has carried out various researchs.In JP2012- The embodiment of research is disclosed in 025280.In the tire disclosed in this article, the length triangle rubber smaller than traditional triangle adhesive tape Item (hereinafter, also referred to as small apex strip) is used for tyre bead.In addition, another apex strip (hereinafter, also referred to as supports Layer) it is arranged and digs the axially external of part in carcass.In tire, by so arranging the structure of bead part, improve Durability and alleviate weight.

Reference listing

Patent document

Patent document 1：JP2005-255047

Patent document 2：JP2012-025280

Invention content

The problem to be solved in the present invention

In general, tire has the axially external clinch being arranged in tyre bead.These clinch contact the convex of wheel rim Edge.

As described above, under operation, bead part is under heavy duty.Part is dug to be arranged in clinch and tire Between circle.It concentrates on digging on part therefore, it is possible to deformation occur.The concentration of deformation can cause to loosen.It loosens in order to prevent, For example, using the big clinch of thickness, and in some cases, high bending stiffness is assigned for apex strip.However, passing through Rigidity is adjusted, the steering stability of tire is influenced.

Under operation, tire repeated deformation and recovery.This can cause heat repeatedly.Tire bead described above Part has large volume.Therefore, the heat generated in bead part is big.In addition, heat is stored in rubber.Heat is to the resistance to of tire Long property is exerted one's influence.

Because assigning high bending stiffness to bead part, this exerts one's influence to the vertical rigidity of tire.High vertical rigidity is not only It exerts one's influence to riding comfort, and the noise in the frequency range of 80Hz to 100Hz is caused to increase.It is mute in tire Property can be damaged.

The object of the present invention is to provide a kind of inflations improving quietness and durability without reducing steering stability Tire.

In order to improve fuel efficiency, the weight saving of tire is needed strongly.In the tire as disclosed in JP2012-025280 In equally use in the tire of small apex strip and supporting course, compared to the tire for using traditional triangle adhesive tape, bead part Thickness can reduce.Contribute to the weight of mitigation tire using small apex strip and supporting course.Meanwhile the problem of this tire, is, Compared to conventional tire, lateral stiffness is insufficient and steering stability is inadequate.

It is a further object to provide a kind of inflated wheels for alleviating weight while will not reducing steering stability Tire.A further object of the present invention is to provide a kind of inflated wheel improving steering stability while inhibiting quality to increase Tire.

Solution to the problem

According in a first aspect, a kind of pneumatic tire of the present invention includes：Tyre surface, which, which has, forms the outer of tread surface Surface；A pair of sidewall, the sidewall almost extend internally from the end of the tyre surface respectively in radial directions；A pair of of tire overlap joint Portion, the clinch almost extend internally from the end on the sidewall respectively in the radial direction described；A pair of bead, it is described Tyre bead is separately positioned on the inside of the clinch in the axial direction；Carcass, the carcass is along the tyre surface and the tire Extend on another in one and the tyre bead of the inside of side in the tyre bead and between the two tyre beads；And A pair of of band, the band almost extend outwardly from the tyre bead along the carcass respectively in the radial direction described.The tyre bead Including：Core；First apex strip, first apex strip extend outwardly from the core in the radial direction described；And second Apex strip, second apex strip are arranged on the axial direction in the outside of first apex strip.The carcass Including casingply.The casingply is dug on the axial direction from inside towards outside around the core, and And the casingply includes major part and what is formed by digging the casingply dig part.It is described to turn over Part is played to be arranged between first apex strip and second apex strip.The part of digging is in first triangle The major part is contacted in the part of the radial outside of the outer end of adhesive tape.The outer end of second apex strip is described It is arranged in the radial direction on the outside of the end for digging part.The position of the outer end of each band is equal in the radial direction described There is the pneumatic tire outer end setting of position or each band where when maximum width to have institute in the pneumatic tire The radially inner side of the position where when stating maximum width.The complex elastic-modulus of each band is greater than or equal to 60MPa and not high In 70MPa.

According to second aspect, another pneumatic tire of the invention includes：Tyre surface；A pair of sidewall；A pair of bead；Carcass； And a pair of of strengthening course.The sidewall almost extends internally from the end of the tyre surface respectively in radial directions.The tyre bead In the inside for being separately positioned on the sidewall in the radial direction.The carcass along the tyre surface and the sidewall inside Extend on one in the tyre bead and another in the tyre bead and between the two tyre beads.The strengthening course exists It is arranged on axial direction in the outside of the carcass.The tyre bead include core and it is described in the radial direction respectively from the core to The apex strip of outer extension.The strengthening course is described in the radial direction along the carcass from the outer end of the apex strip Neighbouring part extends outwardly, and each strengthening course gradually becomes from the interior section of the strengthening course outward in the radial direction described Carefully.When reference position is defined as the following position on the outer surface of the pneumatic tire, the outer end of the apex strip Each of be arranged in the radial direction in the inside of the reference position described, wherein the position corresponds to when being filled described Air filled tyre is installed on wheel rim and is filled with the pneumatic tire and the wheel rim when air reaches normal internal pressure and connects each other The radially outward edge of tactile contact surface.The inner end of each strengthening course be arranged with the corresponding apex strip in the apex strip Outer end in a radial outward direction at a distance of 10mm position inside.

According to the third aspect, another pneumatic tire of the invention includes：Tyre surface；A pair of sidewall；A pair of of clinch；One To tyre bead；Carcass；A pair of of band；And a pair of of supporting course.The sidewall is several from the end of the tyre surface respectively in radial directions It extends internally.The clinch almost extends internally from the end on the sidewall respectively in the radial direction described.It is described Tyre bead is separately positioned on the inside of the clinch in the axial direction.The carcass is along the tyre surface and the sidewall Extend on another in one and the tyre bead of the inside in the tyre bead and between the two tyre beads.The tyre bead Including core and in the apex strip being arranged in the radial direction in the outside of the core.The carcass includes casingply. The casingply is dug on the axial direction from inside towards outside around the core.The casingply includes Major part and what is formed by digging the casingply dig part.The band is respectively in the apex strip Extend in the radial direction along the major part described in the part of radial outside.The supporting course is in the axial direction On be separately positioned on the outside of the band.When reference position is defined as the following position on the outer surface of the pneumatic tire When, the outer end of each apex strip is arranged in the radial direction described in the inside of the reference position, wherein the position pair Ying Yu is when the pneumatic tire is installed on wheel rim and is filled with the pneumatic tire and institute when air reaches normal internal pressure State the radially outward edge for the contact surface that wheel rim is in contact with each other.Each supporting course is described attached from the reference position in the radial direction Close part almost extends outwardly.

The advantageous effects of the present invention

In pneumatic tires according to the present invention, it is arranged second between part and clinch in digging for casingply Apex strip.Compared to conventional tire, in the tire, digs part and be located in axial inner part.This positioning allows Deformation is forbidden to concentrate on digging on part.The generation of loosening can be reduced, thus the excellent in te pins of durability of tire.

In tire, respectively digs part and be arranged between the first apex strip and the second apex strip.Part is dug the The major part of carcass is contacted in a part for the outer end radial outside of one apex strip.The outer end of second apex strip exists Outside in the end for digging part is set in the radial direction.First apex strip of tire is less than the triangle rubber of conventional tire Item.The first small apex strip allows major part to have suitable profile (also referred to as shell line).Specifically, in tire In, on the sectional view perpendicular to circumferential direction, major part has the profile similar to single arc.The profile allows to forbid becoming Shape is concentrated.The profile contributes to durability.In addition, the profile allows to forbid to be formed one with certain stiffness in side wall portion Part.In tire, the entirety of side wall portion suitably deforms.In tire, the entirety of side wall portion contributes effectively to just Degree.This deforms the steering stability for contributing to tire.

Tire includes the band extended from tyre bead along carcass.The position of the outer end of each band is equal in radial directions to be obtained The radially inner side of the position where obtaining maximum width is arranged in position or outer end where maximum width.Second triangle Adhesive tape is arranged between band and the first apex strip.Contribute to torsional rigidity in the face of tire together with band and the second apex strip. Band and the second apex strip contribute to steering stability.

In tire, it need not use in order to which durability needs and increases the clinch of thickness.In tire, bead part Dividing has small size.Small size allows heat to reduce.Heat reduces the durability for contributing to tire.

Above-mentioned small size allows bead part to have flexible structure.The flexible structure causes the vertical rigidity in tire low. Therefore, oscillation is reduced, and thus the noise in tire reduces.Particularly, in tire, can reduce frequency range 80Hz extremely Noise in 100Hz.The quietness of tire is excellent.

Therefore, it according to the present invention, can obtain improving the inflation of quietness and durability without reducing steering stability Tire.

In another pneumatic tire according to the present invention, using small apex strip, and strengthening course phase is suitably adjusted For the position of apex strip.The thickness of bead part can reduce, and thus the weight of tire can reduce.Since it is possible to obtain in high face Torsional rigidity, therefore although lateral stiffness is low, steering stability is advantageous.According to the present invention, weight saving can be obtained and The pneumatic tire of steering stability is not reduced.

In another pneumatic tire according to the present invention, the outer end of apex strip is arranged in radial directions to be referred to The inside of position.In tire, the apex strip with the length less than traditional triangle adhesive tape is used.Apex strip helps to subtract Light weight.There is tire band, band to extend in radial directions along major part in the part of the radial outside of apex strip. Band contributes to torsional rigidity in face.Tire carries out fast reaction to the operation of deflecting roller.The steering stability of tire is excellent.Tire Further include supporting course, supporting course in the axially external part of band in radial directions from the part near reference position almost Extend outwardly.Supporting course allows the acceleration as deflecting roller is rotated when speed is about 80km/h high Enhance stability under state.Supporting course helps to further increase steering stability.According to the present invention, can obtain improving steering Stability prohibits the increased pneumatic tire of quality simultaneously.

Description of the drawings

[Fig. 1] Fig. 1 is the sectional view of a part for pneumatic tire according to the first embodiment of the invention.

[Fig. 2] Fig. 2 is the enlarged cross-sectional view of a part for tire shown in Fig. 1.

[Fig. 3] Fig. 3 is the sectional view of a part for pneumatic tire second embodiment of the invention.

[Fig. 4] Fig. 4 is the enlarged cross-sectional view of a part for tire shown in Fig. 3.

[Fig. 5] Fig. 5 is the sectional view of a part for the pneumatic tire of third embodiment according to the present invention.

[Fig. 6] Fig. 6 is the enlarged cross-sectional view of a part for tire shown in Fig. 5.

Specific implementation mode

By refer to the attached drawing as one sees fit, the present invention is described in detail below based on preferred embodiment.

[first embodiment]

Fig. 1 shows pneumatic tire 2 according to first embodiment.In Fig. 1, upper and lower directions represents the diameter of pneumatic tire 2 To direction, left and right directions represents the axial direction of pneumatic tire 2, and the direction vertical with the surface of attached drawing paper represents pneumatic tire 2 circumferential direction.In Fig. 1, the alternate dotted line CL of length represents the equatorial plane of pneumatic tire 2.Other than tread contour, The shape of pneumatic tire 2 is symmetrical relative to equatorial plane.In Fig. 1, solid line BBL represents tyre bead baseline.Tyre bead baseline is Limit the line of the rim diameter (referring to JATMA) of the wheel rim (not shown) of pneumatic tire 2 installed above.Tyre bead baseline is in axial side It upwardly extends.

Pneumatic tire 2 include tyre surface 4, penetrating component 6, sidewall 8, clinch 10, tyre bead 12, carcass 14, belt 16, Bandage 18, liner 20, chafer 22 and band 24.Pneumatic tire 2 is tubeless type.Pneumatic tire 2 is installed in passenger car.

In Fig. 1, reference mark Pb represents the point on the inner surface of pneumatic tire 2.At point Pb, pneumatic tire 2 has The axial maximum width showed on the profile of inner surface.In pneumatic tire 2, maximum width is expressed as the left side at point Pb The length on axial direction between surface and right lateral surface (outer surface on sidewall 8).In other words, point Pb represents pneumatic tire 2 positions with maximum width.

Tyre surface 4 has the shape extended radially out.Tyre surface 4 forms the tread surface 26 that can contact road surface.In tire Fluted 28 are formed in face 4.Tread contour is formed by groove 28.Tyre surface 4 includes base layer 30 and crown layer 32.Crown layer 32 It is arranged in radial directions in the outside of base layer 30.Crown layer 32 is laminated in 30 top of base layer.Base layer 30 is by adhesiveness Excellent crosslinking rubber is formed.The typical substrates rubber of base layer 30 is natural rubber.Crown layer 32 by abrasion resistance, heat resistance and The excellent crosslinking rubber of grip performance is formed.

Penetrating component 6 penetrates tyre surface 4.One end of penetrating component 6 is exposed in tread surface 26.Penetrating component 6 Another end contacts bandage 18.Penetrating component 6 extends in circumferential direction.Penetrating component 6 is cricoid.Pneumatic tire 2 It may include multiple penetrating components 6, these penetrating components 6 do not form tubular shape and separated from one another in circumferential direction. Penetrating component 6 is formed by conduction crosslinking rubber.

Sidewall 8 almost extends internally from the end of tyre surface 4 in radial directions.The radially inner side end on sidewall 8 engages tire Clinch 10.Sidewall 8 is formed by cut resistant and the crosslinking rubber having excellent weather resistance.Sidewall 8 prevents carcass 14 impaired.

Clinch 10 is almost arranged in radial directions in the inside on sidewall 8.Clinch 10 is almost in radial direction On extend internally from the end on sidewall 8.The radial outside in tyre bead 12 and carcass 14 is arranged in clinch 10 in the axial direction. Clinch 10 is formed by the crosslinking rubber of excellent in abrasion resistance.Clinch 10 contacts the flange of wheel rim.

Tyre bead 12 is arranged in the axial direction in the inside of clinch 10.Each tyre bead 12 includes core 34, the first triangle rubber Item 36 and the second apex strip 38.Core 34 is annular shape, including non-stretchable coiling.The typical material of coiling is steel.The One apex strip 36 extends outwardly from core 34 in radial directions.First apex strip 36 is radially outward tapered.Two or three Corner rubber strip 38 is arranged in the axially external of the first apex strip 36.Second apex strip 38 is arranged in the axial direction to be overlapped in tire Between portion 10 and carcass 14.In pneumatic tire 2, the outer end 40 of the second apex strip 38 is arranged in the outer of the first apex strip 36 The radial outside at end 42.

In pneumatic tire 2, the first apex strip 36 is formed by just crosslinked rubber composition.That is, the One apex strip 36 is crosslinking rubber.The preferred substrate rubber of rubber composition is dience rubber.Dience rubber it is specific Example includes natural rubber (NR), polyisoprene (IR), polybutadiene (BR), acrylonitrile-butadiene copolymer (NBR) and gathers Chlorobutylene (CR).The rubber for two or more types that can be used in combination.

The rubber composition of first apex strip 36 preferably includes sulphur.The molecule of rubber passes through sulfur cross-linking.As Another kind crosslinking agent can be used in the supplement or alternative of sulphur.Crosslinking can be executed by electron beam.

The rubber composition of first apex strip 36 includes sulphur and vulcanization accelerator.It is based on sulfenyl for example, can be used The vulcanization accelerator of amine, the vulcanization accelerator based on guanidine, the vulcanization accelerator based on thiazole, the vulcanization accelerator based on thiuram With dithiocarbamate vulcanization accelerator.

The rubber composition of first apex strip 36 includes reinforcing agent.Reinforcing agent is typically carbon black.Usable such as FEF, The carbon black of GPF, HAF, ISAF and SAF.From the perspective of the intensity of the first apex strip 36, every 100 parts (by weight) The amount of the carbon black of base rubber is preferably larger or equal than 5 parts (by weight).From the angle flexible of the first apex strip 36 From the point of view of, the amount of carbon black is preferably not more than 50 parts (by weight).As the supplement or alternative of carbon black, silica can be used. In this case, dry silica and wet silica can be used.

The rubber composition of first apex strip 36 includes softening agent.The preferable example of softening agent include paraffinic, Naphthenic and aromatic series processing oil.From the perspective of the flexibility of the first apex strip 36,100 parts of base rubber (are pressed Weight meter) in the amount of softening agent be preferably larger or equal than 10 parts (by weight).From the intensity of the first apex strip 36 From the point of view of angle, the amount of softening agent is preferably not more than 40 parts (by weight).

As one sees fit, stearic acid, zinc oxide, antioxidant, wax, friendship are added into the rubber composition of the first apex strip 36 Join activating agent etc..

In pneumatic tire 2, the second apex strip 38 is formed by just crosslinked rubber composition.Rubber composition Preferred substrate rubber is dience rubber.The specific example of dience rubber include natural rubber (NR), polyisoprene (IR), Polybutadiene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).Can be used in combination two or more types The rubber of type.

The rubber composition of second apex strip 38 preferably includes sulphur.The molecule of rubber passes through sulfur cross-linking.As Another kind crosslinking agent can be used in the supplement or alternative of sulphur.Crosslinking can be executed by electron beam.

The rubber composition of second apex strip 38 includes sulphur and vulcanization accelerator.It is based on sulfenyl for example, can be used The vulcanization accelerator of amine, the vulcanization accelerator based on guanidine, the vulcanization accelerator based on thiazole, the vulcanization accelerator based on thiuram With dithiocarbamate vulcanization accelerator.

The rubber composition of second apex strip 38 includes reinforcing agent.Reinforcing agent is typically carbon black.Usable such as FEF, The carbon black of GPF, HAF, ISAF and SAF.From the perspective of the intensity of the second apex strip 38,100 parts of base rubber (press weight Gauge) in the amount of carbon black be preferably larger or equal than 5 parts (by weight).Come from the angle flexible of the second apex strip 38 It sees, the amount of carbon black is preferably not more than 50 parts (by weight).As the supplement or alternative of carbon black, silica can be used. In this case, dry silica and wet silica can be used.

The rubber composition of second apex strip 38 includes softening agent.The preferable example of softening agent include paraffinic, Naphthenic and aromatic series processing oil.From the perspective of the flexibility of the second apex strip 38,100 parts of base rubber (are pressed Weight meter) in the amount of softening agent be preferably larger or equal than 10 parts (by weight).From the intensity of the second apex strip 38 From the point of view of angle, the amount of softening agent is preferably not more than 40 parts (by weight).

As one sees fit, stearic acid, zinc oxide, antioxidant, wax, friendship are added into the rubber composition of the second apex strip 38 Join activating agent etc..

Carcass 14 includes casingply 44.Casingply 44 prolongs on the tyre bead 12 of both sides and between tyre bead 12 It stretches.Casingply 44 extends along the inside on tyre surface 4 and sidewall 8.Casingply 44 in the axial direction from inside towards It is dug around each core 34 in outside.It is dug by this, casingply 44 includes major part 46 and digs part 48.It is inflating In tire 2, the end 50 for digging part 48 is disposed radially inwardly from the position Pb for obtaining maximum width.Dig the end of part 48 Portion 50 is inwardly arranged from the outer end of clinch 10 52 in radial directions.Each end 50 of part 48 is dug in radial direction On be arranged between the inner end 54 and outer end 40 of the second apex strip 38.The setting of end 50 for digging part 48 is attached in core 34 Closely.Carcass 14 has so-called " low lifting structure ".

Casingply 44 includes multiple cords and rubberizing rubber aligned with each other.Angle of each cord relative to equatorial plane The absolute value of degree is 75 ° to 90 °.In other words, carcass 14 forms radial structure.Cord is formed by organic fiber.Organic fiber Preferable example include polyester fiber, nylon fiber, rayon fiber, polyethylene naphthalate fiber and aromatic polyamides Fiber.Carcass 14 may include two or more carcass curtain sheet 44.From the perspective of the influence to quality, carcass 14 is preferably It is formed by a casingply 44.

Belt 16 is arranged in radial directions in the inside of tyre surface 4.Belt 16 is laminated in 14 top of carcass.Belt 16 reinforce carcass 14.Belt 16 includes internal layer 56 and outer layer 58.Such as from Fig. 1 clearly, in the axial direction, internal layer 56 Width is slightly larger than the width of outer layer 58.Each of internal layer 56 and outer layer 58 include multiple cords aligned with each other and unshowned Rubberizing rubber.Each cord is tilted relative to equatorial plane.The absolute value at inclination angle will be generally greater than or equal to 10 ° and be not more than 35 °. Inclined direction phase of the cord of internal layer 56 relative to the inclined direction of equatorial plane and the cord of outer layer 58 relative to equatorial plane Instead.The preferred material of cord is steel.Organic fiber can be used for cord.The width of belt 16 in the axial direction is preferably more than Or 0.7 times of the maximum width equal to pneumatic tire 2.Belt 16 may include three or more layers.

Bandage 18 is arranged in radial directions in 16 outside of belt.In the axial direction, the width of bandage 18 is big In the width of belt 16.Bandage 18 includes cord and unshowned rubberizing rubber.Cord is by spiral winding.Bandage 18 has There is so-called non junction structure.Cord substantially extends in circumferential direction.The angle in cord direction with respect to the circumferential direction be less than or Equal to 5 °, it is more preferably, less than or equal to 2 °.Belt 16 is kept by cord, and belt 16 is forbidden to be lifted as a result,.Cord It is formed by organic fiber.The preferable example of organic fiber includes nylon fiber, polyester fiber, rayon fiber, poly- naphthalenedicarboxylic acid Glycol ester fiber and aramid fibre.

The setting of liner 20 is in 14 inside of carcass.Liner 20 engages the inner surface of carcass 14.Liner 20 is excellent by air-tightness Crosslinking rubber is formed.The typical substrates rubber of liner 20 is butyl rubber or halogenated isobutylene-isoprene rubber Glue.Liner 20 keeps the internal pressure of pneumatic tire 2.

Chafer 22 is arranged near tyre bead 12.Such as from attached drawing clearly, chafer 22 is in the axial direction It is dug from inside towards outside around tyre bead 12.One end 60 of each chafer 22 is arranged in the axial direction in carcass 14 Outside.This end 60 of chafer 22 is arranged in the axial direction is digging between part 48 and clinch 10.Respectively Another end 62 of chafer 22 is arranged in the axial direction in the inside of carcass 14.Another end of chafer 22 62 are arranged in radial directions in the inside of the outer end 42 of the first apex strip 36.It is installed on wheel rim when by pneumatic tire 2 When, chafer 22 contacts wheel rim.By this contact, some parts near tyre bead 12 are protected.In present embodiment In, chafer 22 is formed by fabric and the rubber padded in the fabric.

It is arranged in the axial direction in the outside of the major part 46 of casingply 44 with 24.Band 24 is in radial directions Almost extend outwardly from tyre bead 12 along major part 46.The outer end 64 of each band 24 is arranged in radial directions in clinch The outside of 10 outer end 52.The inner end 66 of each band 24 be arranged in the axial direction major part 46 and clinch 10 it Between.It is arranged in radial directions in the outside for the end 50 for digging part 48 with 24 inner end 66.

In pneumatic tire 2, band 24 is formed by just crosslinked rubber composition.The preferred substrate rubber of rubber composition Glue is dience rubber.The specific example of dience rubber includes natural rubber (NR), polyisoprene (IR), polybutadiene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).The rubber for two or more types that can be used in combination.

Sulphur is preferably included with 24 rubber composition.The molecule of rubber passes through sulfur cross-linking.Supplement as sulphur Or substitute, another kind crosslinking agent can be used.Crosslinking can be executed by electron beam.

Include sulphur and vulcanization accelerator with 24 rubber composition.For example, the vulcanization based on sulfenamide can be used to promote Vulcanization accelerator into agent, based on guanidine, the vulcanization accelerator based on thiazole, the vulcanization accelerator based on thiuram and two thio ammonia Carbamate vulcanization accelerator.

Include reinforcing agent with 24 rubber composition.Reinforcing agent is typically carbon black.Can be used such as FEF, GPF, HAF, The carbon black of ISAF and SAF.From the perspective of the intensity of band 24, the carbon black of the base rubber of every 100 parts (by weight) Amount is preferably larger or equal than 5 parts (by weight).From the perspective of the flexibility of band 24, the amount of carbon black is preferably not more than 50 Part (by weight).As the supplement or alternative of carbon black, silica can be used.In this case, dry titanium dioxide can be used Silicon and wet silica.

Include softening agent with 24 rubber composition.The preferable example of softening agent includes paraffinic, naphthenic With aromatic series processing oil.From the perspective of the flexibility of band 24, the amount of the softening agent of the base rubber of every 100 parts (by weight) Preferably larger or equal than 10 parts (by weight).From the perspective of the intensity of band 24, the amount of softening agent is preferably not more than 40 parts (by weight).

As one sees fit, stearic acid, zinc oxide, antioxidant, wax, cure activating ingredient are added into the rubber composition of band 24 Deng.

Fig. 2 shows a parts for pneumatic tire shown in Fig. 12.Fig. 2 shows 12 parts of tyre bead of pneumatic tire 2.Scheming In 2, upper and lower directions represents the radial direction of pneumatic tire 2, and left and right directions represents the axial direction of pneumatic tire 2, with attached drawing paper The vertical direction in surface represent the circumferential direction of pneumatic tire 2.

In pneumatic tire 2, the second apex strip 38 is arranged digs part 48 and clinch in casingply 44 Between 10.In pneumatic tire 2, part is dug compared to conventional tire, part 48 is dug and is arranged in axially inner side part.This A positioning allows that deformation is forbidden to concentrate on digging on part 48.The generation of loosening can be reduced, as a result, the durability of pneumatic tire 2 It is excellent.

In pneumatic tire 2, respectively digs part 48 and be arranged between the first apex strip 36 and the second apex strip 38.It turns over Play the main portion that part 48 contacts casingply 44 in a part for 42 radial outside of outer end of the first apex strip 36 Divide 46.The outside in the end 50 for digging part 48 is arranged in the outer end 40 of second apex strip 38 in radial directions.Inflation First apex strip 36 of tire 2 is less than the apex strip of conventional tire.The first small apex strip 36 allows major part 46 With suitable profile (also referred to as shell line).Specifically, in pneumatic tire 2, in the sectional view perpendicular to circumferential direction On, it is expressed as having being arranged to the profile of the major part 46 near core 34 near the end of belt 16 and inflate The circular camber line at the center on the inside of the inner surface of tire 2.In other words, on the sectional view of pneumatic tire 2, major part 46 With the profile for being similar to single camber line.The profile allows that deformation is forbidden to concentrate.The profile contributes to durability.

As described above, in pneumatic tire 2, major part 46 has the profile for being similar to single arc.The profile allows to prohibit The part with certain stiffness is only formed in 8 part of the sidewall of pneumatic tire 2.In pneumatic tire 2,8 part of sidewall It is whole to deform as one sees fit.In pneumatic tire 2, the entirety of 8 part of sidewall effectively contributes to rigidity.This deformation contributes to inflated wheel The steering stability of tire 2.

Pneumatic tire 2 includes band 24, and band 24 extends along carcass 14 from tyre bead 12.The position of the outer end 64 of each band 24 exists Diameter in the position Pb for obtaining maximum width is set equal to the position Pb or outer end 64 for obtaining maximum width in the radial direction Inwardly.Second apex strip 38 is arranged between band 24 and the first apex strip 36.Band 24 is along major part 46 from second The outer end 40 of apex strip 38 extends radially outwards.With 24 and second apex strip 38 contribute to the face of pneumatic tire 2 together Interior torsional rigidity.Band 24 and the second apex strip 38 contribute to steering stability.In addition, in pneumatic tire 2, outer end 64 does not have There is the radial outside being arranged in the position Pb for obtaining maximum width, thus influence of the band 24 to quality and rolling resistance reduces.

In pneumatic tire 2, the clinch 10 for increasing thickness for durability need not be used.In pneumatic tire 2 In, 12 part of tyre bead has the small volume than conventional tire.Small size allows the heat generated to reduce.The heat of generation is reduced Contribute to the durability of pneumatic tire 2.

Above-mentioned small size allows 12 part of tyre bead to have flexible structure.Flexible structure causes vertical in pneumatic tire 2 Rigidity is low.Therefore, vibration reduces, thus the noise decrease in pneumatic tire 2.Particularly, in pneumatic tire 2, from 80Hz to Noise in the frequency range of 100Hz can be reduced.The quietness of pneumatic tire 2 is excellent.

Therefore, in pneumatic tire 2, the first apex strip 36, the second apex strip 38 and band 24 contribute to major part The volume of 12 part of raising and tyre bead of torsional rigidity reduces in 46 suitable profile, face.Therefore, in pneumatic tire 2, change Quietness and durability have been apt to it, without reducing steering stability.That is, according to the present invention, can obtain improving mute Property and durability without reduce steering stability pneumatic tire 2.

In pneumatic tire 2, the complex elastic-modulus Es of band 24 greater than or equal to 60Mpa and is not higher than 70Mpa.Work as elasticity When modulus Es is set above or is equal to 60MPa, band 24 contributes to torsional rigidity in face.The steering stability of pneumatic tire 2 It is excellent.When elastic modulus E s is configured to not higher than 70MPa, influence of the band 24 to rigidity can be reduced.In pneumatic tire 2, Suitably keep riding comfort.

In the present invention, standard " JIS K 6394 " is deferred to, the complex elastic-modulus Es of band 24 is measured.Measuring condition is such as Under.In a manner of identical with complex elastic-modulus Es, the complex elastic-modulus E1 of the first apex strip 36 as described below is measured Or second apex strip 38 complex elastic-modulus E2.

Viscoplasticity frequency spectrograph：" VESF-3 " of Iwamoto Seisakusho

Initial strain：10%

Dynamic strain：± 1%

Frequency：10Hz

Deformation pattern：Tensioning

Measuring temperature：70℃

In pneumatic tire 2, the complex elastic-modulus E1 of the first apex strip 36 is preferably higher than or equal to 60MPa and excellent Selection of land is not higher than 70MPa.When elastic modulus E 1 is set above or is equal to 60MPa, the first apex strip 36 helps to prop up Hold pneumatic tire 2.The steering stability of pneumatic tire 2 is excellent.When elastic modulus E 1 is configured to not higher than 70MPa, first Influence of the apex strip 36 to rigidity reduces.In pneumatic tire 2, riding comfort is suitably kept.

In pneumatic tire 2, the complex elastic-modulus E2 of the second apex strip 38 is preferably higher than or equal to 60MPa and excellent Selection of land is not higher than 70MPa.When elastic modulus E 2 is set above or is equal to 60MPa, the second apex strip 38 contributes to face Interior torsional rigidity.The steering stability of pneumatic tire 2 is excellent.When elastic modulus E 2 is configured to not higher than 70MPa, the two or three Influence of the corner rubber strip 38 to rigidity reduces.In pneumatic tire 2, riding comfort is suitably kept.

As described above, in pneumatic tire 2, band 24 is formed by crosslinking rubber.Second apex strip 38 is by crosslinking rubber shape At.First apex strip 36 is formed by crosslinking rubber.From the perspective of productivity, the second apex strip 38 is preferably by being crosslinked Rubber is formed, and the crosslinking rubber of band 24 is similar to.From the point of view of same angle, the first apex strip 36 is preferably by crosslinking rubber shape At similar to the crosslinking rubber of band 24.It is particularly preferred that the first apex strip 36 and the second apex strip 38 by with band 24 Crosslinking rubber is formed as crosslinking rubber, that is to say, that the first apex strip 36, the second apex strip 38 and band 24 are by orthogonal The identical rubber composition of connection is formed.

In fig. 2, reference mark F represents the maximum position of distance near each tyre bead 12, from carcass 14 to side surface. Double-headed arrow Hf represent in radial directions slave tyre bead baseline to the height of position F.Height Hf is assembled corresponding to pneumatic tire 2 The height of the flange of wheel rim wherein.Generally, height Hf is configured to be greater than or equal to 25mm and is not more than 30mm.Double end Arrow Hc represents the height slave an end 60 of tyre bead baseline to chafer 22 in radial directions.

Pneumatic tire 2 is assembled in wheel rim, is used.In a state of use, in pneumatic tire 2 with wheel rim The corresponding position in outer end in the radial direction of flange generates large deformation.As described above, in pneumatic tire 2, in position F Place, (the double-headed arrow t) in Fig. 2 is maximum for the thickness from carcass 14 to side surface.In pneumatic tire 2, it effectively prevent using shape The influence of large deformation under state.The excellent in te pins of durability of pneumatic tire 2.

In pneumatic tire 2, an end 60 of chafer 22 is preferably located on the radially inner side of above-mentioned position F. Therefore, influence of the chafer 22 to cost and quality reduces, in addition, preventing from deforming an end for concentrating on chafer 22 On 60.Due to preventing generating loosening, the excellent in te pins of durability of pneumatic tire 2 in chafer.From this view point, high Degree Hc is preferably less or equal to 22mm, is more preferably, less than or is equal to 15mm.

As described above, chafer 22 contacts wheel rim.In a state of use, chafer 22 is overlayed wheel rim.It is inflating In tire 2, an end 60 of chafer 22, which is clipped in, digs between part 48 and clinch 10.One of chafer 22 End 60 is not in contact with wheel rim, as a result, in pneumatic tire 2, chafer 22 is effectively prevent to be removed from pneumatic tire 2.It fills The excellent in te pins of durability of air filled tyre 2.From this view point, above-mentioned height Hc is preferably no less than 5mm, it is highly preferred that being not less than 8mm。

In fig. 2, double-headed arrow L1 represents the length of the first apex strip 36.Length L1 is represented as from the first triangle rubber The length of its outer end 42 is arrived at center (the reference mark Pa in Fig. 2) on the axial direction of the bottom surface of item 36.

In pneumatic tire 2, length L1 is preferably larger or equal than 5mm and preferably not more than 15mm.When length L1 quilts When being set greater than or being equal to 5mm, the first apex strip 36 can contribute effectively to lateral stiffness.The steering of pneumatic tire 2 is steady It is qualitative excellent.When length L1 is configured to no more than 15mm, the carcass 14 with suitable profile can be obtained.Carcass 14 contributes to The durability and steering stability of pneumatic tire 2.In addition, the first small apex strip 36 helps to reduce noise.

In fig. 2, double-headed arrow Lp is represented from the outer end 42 of the first apex strip 36 to the end 50 for digging part 48 Length.As described above, in the part of 42 radial outside of outer end of the first apex strip 36, digs part 48 and contact mainly Part 46.Length Lp also represents major part 46 and digs the length that part 48 overlaps each other.

In pneumatic tire 2, length Lp is preferably larger or equal than 10mm.Therefore, part 48 and major part 46 are dug Contact it is sufficient.This come into full contact with prevents from generating loosening in digging part 48.From the angle to quality and the influence of cost From the point of view of, length Lp is preferably not more than 20mm, is more preferably, no greater than 15mm.

In fig. 2, double-headed arrow Ls represents the length of band 24.Length Ls be represented as from the inner end of band 24 66 to its outside The length of end 64.Length Ls is measured along band 24.

In pneumatic tire 2, length Ls is preferably larger or equal than 40mm and preferably not more than 70mm.As length Ls When being configured to be greater than or equal to 40mm, band 24 contributes to torsional rigidity in face.The steering stability of pneumatic tire 2 is excellent.From From the point of view of this angle, length Ls is more preferably greater than or equal to 50mm.When length Ls is configured to no more than 70mm, band 24 is right The influence of rigidity reduces.In pneumatic tire 2, riding comfort is suitably kept.From this view point, length Ls is more preferable Ground is not more than 60mm.In pneumatic tire 2, from the perspective of steering stability and quality, the thickness of band 24 is preferably more than Or it is equal to 0.5mm and preferably not more than 2mm.

In Fig. 1, double-headed arrow Hb represent in radial directions slave tyre bead baseline to obtaining the position Pb of maximum width Height.In the present invention, height Hb represents reference altitude.Double-headed arrow Hs represent in radial directions slave tyre bead baseline to Height with 24 outer end 64.Double-headed arrow H2 represent in radial directions slave tyre bead baseline to the second apex strip 38 The height of outer end 40.Double-headed arrow Hr represent in radial directions slave tyre bead baseline to the height for the end 50 for digging part 48 Degree.

As described above, in pneumatic tire 2, the position of the outer end 64 of band 24 is equal in radial directions obtains maximum width The radially inner side in the position Pb for obtaining maximum width is arranged in the position Pb of degree or the outer end 64 of band 24.Therefore, height Hs It is less than or equal to 1 with the ratio of reference altitude Hb.Therefore, influence of the band 24 to rolling resistance reduces.It is anti-in sufficient face from obtaining From the perspective of turning round rigidity, which is preferably no less than 0.7.

In pneumatic tire 2, from the perspective of the suitable help from the second apex strip 38 to rigidity, height H2 is preferably More than or equal to 30mm and preferably not more than 40mm.

In pneumatic tire 2, from the perspective of digging suitable help of the part 48 to rigidity, height Hr is preferably more than Or it is equal to 20mm and preferably not more than 80mm.

In the present invention, it is installed on normal wheel rim in pneumatic tire 2 and is charged air and reach normal internal pressure In the state of, measure the size and angle of each component of pneumatic tire 2.During measuring, do not apply to pneumatic tire 2 Load.In description herein, normal wheel rim means the wheel rim specified under the standard that pneumatic tire 2 is deferred to.JATMA standards Under " standard rim ", TRA substandard " design wheel rim " and ETRTO substandard " measurement wheel rim " be normal wheel rim.At this In description in text, normal internal pressure means the internal pressure specified under the standard that pneumatic tire 2 is deferred to.JATMA standards Under " highest air pressure ", " maximum value " that describes in TRA substandard " the loading of tire limit value under each cold inflation pressure " It is normal internal pressure with ETRTO substandard " bulbs of pressure ".When pneumatic tire 2 is used for passenger car, it is in internal pressure It is measured size in the state of 180kPa and angle.Also by with for pneumatic tire 2 it is identical in a manner of, measure following real according to second Apply the size and angle of the pneumatic tire of mode and the component according to the pneumatic tire of third embodiment.

[second embodiment]

Fig. 3 shows the pneumatic tire 102 according to second embodiment.In figure 3, upper and lower directions represents pneumatic tire 102 Radial direction, left and right directions represents the axial direction of pneumatic tire 102, and the direction vertical with the surface of attached drawing paper, which represents, to be filled The circumferential direction of air filled tyre 102.In figure 3, the alternate dotted line CLa of length represents the equatorial plane of pneumatic tire 102.In addition to tire Except the decorative pattern of face, the shape of pneumatic tire 102 is symmetrical relative to equatorial plane.

Pneumatic tire 102 is installed on wheel rim Ra.Wheel rim Ra is normal wheel rim.Pneumatic tire 102 is charged air.Inflation The internal pressure of tire 102 is normal internal pressure.

In pneumatic tire 102 on being installed to wheel rim Ra, the part contact wheel rim Ra of pneumatic tire 102.In Fig. 3 In, reference label Paa represents the specific position on the outer surface of pneumatic tire 102.Position Paa, which corresponds to, works as pneumatic tire 102 It is installed on wheel rim Ra and is charged where pneumatic tire 102 and wheel rim Ra when air reaches normal internal pressure be in contact with each other Surface radially outward edge.In the present invention, position Paa is referred to as reference position.

In figure 3, solid line BBLa represents tyre bead baseline.Tyre bead baseline is the wheel rim for limiting pneumatic tire 102 installed above The line of the rim diameter (referring to JATMA) of Ra.Tyre bead baseline extends in the axial direction.Double-headed arrow Haa is represented in radial side It is upward slave tyre bead baseline to the height of reference position Paa.The range of height Haa is typically from 20mm to 25mm.Double-headed arrow Ha represents the height slave tyre bead baseline to radially outer end (also referred to as equator) of pneumatic tire 102 in radial directions.It is high Degree Ha is the cross section height of pneumatic tire 102.

Pneumatic tire 102 includes tyre surface 104, penetrating component 106, a pair of sidewall 108, a pair of of clinch 110, a pair of of tire Circle 112, carcass 114, belt 116, a pair of of edge bandage 118, liner 120, a pair of bead infantees 122 and a pair of of strengthening course 124.Pneumatic tire 102 is tubeless type.Pneumatic tire 102 is installed in passenger car.

In figure 3, reference mark Pba represents the specific position on the inner surface of pneumatic tire 102.At the Pba of position, fill Air filled tyre 102 has the axial maximum width showed on the profile of inner surface.In pneumatic tire 102, the left side at the Pba of position The length on axial direction between side surface and right lateral surface (outer surface on sidewall 108) is represented as pneumatic tire 102 Maximum width (also referred to as section view width).In the present invention, position Pba is the position that pneumatic tire 102 has maximum width.

Tyre surface 104 has the shape extended radially out.Tyre surface 104 forms the tread surface 126 that can contact road surface. Fluted 128 are formed in tyre surface 104.Tread contour is formed by groove 128.Tyre surface 104 includes base layer 130 and crown layer 132.Crown layer 132 is arranged in radial directions in the outside of base layer 130.Crown layer 132 is laminated in 130 top of base layer. Base layer 130 is formed by the excellent crosslinking rubber of adhesiveness.The typical substrates rubber of base layer 130 is natural rubber.Crown layer 132 are formed by the excellent crosslinking rubber of abrasion resistance, heat resistance and grip performance.

Penetrating component 106 penetrates tyre surface 104.One end of penetrating component 106 is exposed in tread surface 126.It penetrates Another end of part 106 contacts belt 116.Penetrating component 106 extends in circumferential direction.In other words, penetration portion It is cricoid to divide 106.Pneumatic tire 102 may include multiple penetrating components 106, these penetrating components 106 do not form ring-type Shape and separated from one another in circumferential direction.Penetrating component 106 is formed by conduction crosslinking rubber.

Sidewall 108 almost extends internally from the end of tyre surface 104 in radial directions respectively.The radial outside on sidewall 108 Part engaging tread 104.The radially inner side end on sidewall 108 engages clinch 110.Sidewall 108 is by cut resistant and weatherability Excellent crosslinking rubber is formed.Sidewall 108 prevents carcass 114 impaired.

Clinch 110 almost extends internally from the end on sidewall 108 in radial directions respectively.Clinch 110 exists It is arranged on axial direction in the outside of tyre surface 112 and carcass 114.Clinch 110 is formed by the crosslinking rubber of excellent in abrasion resistance. Clinch 110 contacts the flange F a of wheel rim Ra.

Tyre bead 112 is separately positioned on the inside of clinch 110 in the axial direction.Clinch 110 is in radial direction On almost extend internally from the end on sidewall 108.Therefore, tyre bead 112 is arranged in radial directions in the inside on sidewall 108.Respectively Tyre bead 112 includes core 134 and apex strip 136.Core 134 is annular shape, including non-stretchable coiling.The typical material of coiling Material is steel.Apex strip 136 is arranged in radial directions in the outside of core 134.Apex strip 136 is in radial directions from core 134 extend outwardly.Apex strip 136 is radially outward tapered.Apex strip 136 is formed by high rigidity crosslinking rubber.Triangle Adhesive tape 136 is also referred to as the first apex strip.

In pneumatic tire 102, apex strip 136 is formed by just crosslinked rubber composition.Rubber composition Preferred substrate rubber is dience rubber.The specific example of dience rubber include natural rubber (NR), polyisoprene (IR), Polybutadiene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).Can be used in combination two or more types The rubber of type.

The rubber composition of apex strip 136 includes reinforcing agent.Reinforcing agent is typically carbon black.Usable such as FEF, GPF, The carbon black of HAF, ISAF and SAF.From the perspective of the intensity of apex strip 136, the base rubber of every 100 parts (by weight) The amount of carbon black be preferably larger or equal than 5 parts (by weight).From the perspective of the flexibility of apex strip 136, carbon black Amount is preferably not more than 50 parts (by weight).From the perspective of heat is reduced caused by deformation, the supplement as carbon black Or substitute, silica can be used.In this case, dry silica and wet silica can be used.

As one sees fit, crosslinking agent is added into the rubber composition of apex strip 136, softening agent, stearic acid, zinc oxide, is resisted Oxidant, wax, cure activating ingredient etc..

Carcass 114 includes a casingply 138.Casingply 138 is overlapped along tyre surface 104, sidewall 108 and tire The inside in portion 110 extends on the tyre bead 112 of both sides and between tyre bead 112.Casingply 138 in the axial direction from It is dug towards outside around each core 134 inside.It is dug by this, casingply 138 includes major part 140 and digs portion Divide 142.The structure of carcass 114 is referred to as " 1-0 structures ".Carcass 114 may include two or more casingplies 138.

Such as from Fig. 3 clearly, the end 144 for digging part 142 is arranged near the Paa of reference position.Dig part 142 Contribute to the rigidity of 112 part of tyre bead of pneumatic tire 102.Therefore the end 144 for digging part 142 is arranged in reference position The structure of carcass 114 near Paa is referred to as low digging (LTU) structure.Carcass 114 can be configured to so that dig part 142 End 144 be arranged pneumatic tire 102 have maximum width position Pba radial outside.Carcass with this structure 114 structure is referred to as height and digs (HTU) structure.In this case, in pneumatic tire 102, digging part 142 mainly has Rigidity in helping from maximum width position Pba to the region of core 134.The height grown with the length for digging part 142 digs knot The carcass 114 of structure contributes to the rigidity of pneumatic tire 102.Meanwhile with the short low lifting structure of length for digging part 142 Carcass 114 contributes to the weight saving of pneumatic tire 102.

In figure 3, double-headed arrow Hwa represent in radial directions slave tyre bead baseline to the height of maximum width position Pba Degree.Double-headed arrow Hca represent in radial directions slave tyre bead baseline to the height for the end 144 for digging part 142.

As described above, in pneumatic tire 102, carcass 114 has LTU structures.In pneumatic tire 102, height Hca with The ratio of height Hwa is greater than or equal to 0.2 and is not more than 0.4.When carcass 114 has HTU structures, height Hca and height Hwa Ratio be greater than or equal to 1.1 and be not more than 1.3.

Casingply 138 includes multiple cords and rubberizing rubber aligned with each other.Each cord is relative to equatorial plane The absolute value of angle is 75 ° to 90 °.In other words, carcass 114 forms radial structure.Cord is formed by organic fiber.Organic fibre The preferable example of dimension includes polyester fiber, nylon fiber, rayon fiber, polyethylene naphthalate fiber and aromatics polyamides Amine fiber.

Belt 116 is arranged in radial directions in the inside of tyre surface 104.Belt 116 is laminated in 114 top of carcass. Belt 116 reinforces carcass 114.Belt 116 includes internal layer 146 and outer layer 148.Such as from Fig. 3 clearly, in the axial direction On, the width of internal layer 146 is slightly larger than the width of outer layer 148.Each of internal layer 146 and outer layer 148 include aligned with each other more A cord and unshowned rubberizing rubber.Each cord is tilted relative to equatorial plane.The absolute value at inclination angle is typically larger than or waits In 10 ° and it is not more than 35 °.The cord of internal layer 146 is relative to the inclined direction of equatorial plane and the cord of outer layer 148 relative to red The inclined direction of road plane is opposite.The preferred material of cord is steel.Organic fiber can be used for cord.Belt 116 is in axial side Upward width is preferably larger or equal than 0.7 times of the maximum width of pneumatic tire 102.Belt 116 may include three or More layers.

The radial outside in belt 116 is arranged in edge bandage 118, respectively near the end of belt 116.Each side Edge bandage 118 includes cord and unshowned rubberizing rubber.Cord is by spiral winding.Edge bandage 118 has so-called Non junction structure.Cord substantially extends in circumferential direction.Cord with respect to the circumferential direction direction angle be less than or equal to 5 °, more It is preferably less than or equal to 2 °.The end of belt 116 is kept by cord, and belt 116 is forbidden to be lifted as a result,.Cord by Organic fiber is formed.The preferable example of organic fiber includes nylon fiber, polyester fiber, rayon fiber, poly- naphthalenedicarboxylic acid second Terephthalate fibers and aramid fibre.

The setting of liner 120 is in 114 inside of carcass.Liner 120 engages the inner surface of carcass 114.Liner 120 is excellent by air-tightness Different crosslinking rubber is formed.The typical substrates rubber of liner 120 is butyl rubber or halogenated isobutylene-isoamyl Diene rubber.Liner 120 keeps the internal pressure of pneumatic tire 102.

Chafer 122 is separately positioned near tyre bead 112.When pneumatic tire 102 is installed on wheel rim Ra, tire It encloses infantees 122 and contacts wheel rim Ra.By the contact, some parts near tyre bead 112 are protected.In the present embodiment, Chafer 122 is formed by fabric and the rubber padded in the fabric.Chafer 122 can form one with clinch 110. In this case, the material identical of the material of chafer 122 and clinch 110.

Strengthening course 124 is arranged in the axial direction in the outside of carcass 114.Such as from attached drawing clearly, strengthening course 124 exists The axially external of carcass 114 is laminated in 114 top of carcass.Each strengthening course 124 is radially therefrom inboard portion outward radial and gradually becomes Carefully.Strengthening course 124 is also referred to as band.Strengthening course 124 is also referred to as the second apex strip.

In pneumatic tire 102, strengthening course 124 is formed by just crosslinked rubber composition.Rubber composition it is excellent It is dience rubber to select base rubber.The specific example of dience rubber includes natural rubber (NR), polyisoprene (IR), gathers Butadiene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).Can be used in combination two or more types Rubber.

The rubber composition of strengthening course 124 preferably includes reinforcing agent.Reinforcing agent is typically carbon black.Usable such as FEF, The carbon black of GPF, HAF, ISAF and SAF.From the perspective of the intensity of strengthening course 124, the matrix rubber of every 100 parts (by weight) The amount of the carbon black of glue is preferably larger or equal than 5 parts (by weight).From the perspective of the flexibility of strengthening course 124, carbon black Amount is preferably not more than 50 parts (by weight).From the perspective of heat is reduced caused by deformation, the supplement as carbon black Or substitute, silica can be used.In this case, dry silica and wet silica can be used.

As one sees fit, crosslinking agent, softening agent, stearic acid, zinc oxide, antioxygen are added into the rubber composition of strengthening course 124 Agent, wax, cure activating ingredient etc..

In figure 3, double-headed arrow Laa represents the length of apex strip 136.Length Laa is represented as from apex strip 136 Bottom surface 150 center (the reference mark Pca in Fig. 3) in the radial direction arrive its outer end 152 length.

In pneumatic tire 102, the outer end 152 of apex strip 136 is arranged in radial directions reference position Paa's Inside.In pneumatic tire 102, the length of apex strip 136 is less than the length of traditional triangle adhesive tape.Use small apex strip 136 allow to design 112 part of tyre bead with small thickness.Apex strip 136 contributes to the weight saving of pneumatic tire 102. In addition, small apex strip 136 allows casingply 138 to have suitable profile (also referred to as shell line).Specifically, it is hanging down Directly on the sectional view of the circumferential direction of pneumatic tire 102, the profile of casingply 138 is similar to and pneumatic tire 102 Single camber line on the vertical sectional view of circumferential direction.The profile allows that deformation is forbidden to concentrate.Small apex strip 136 additionally aids Improve durability.In addition, since casingply 138 has suitable profile, in pneumatic tire 102,108, sidewall The overall deformation divided.108 part of sidewall is forbidden to deform in a specific way, the entirety of 108 part of sidewall contributes to inflated wheel as a result, The rigidity of tire 102.The profile of casingply 138 contributes to the steering stability of pneumatic tire 102.From this view point, The length Laa of apex strip 136 is preferably less or equal to 15mm.In pneumatic tire 102, length Laa is preferably no less than 5mm.Length Laa, which is configured to the apex strip 136 not less than 5mm, contributes to the rigidity of 112 part of tyre bead.Apex strip 136 Allow that production pneumatic tire 102 is avoided to have any problem.

In pneumatic tire 102, each strengthening course 124 is along carcass 114 near the outer end of apex strip 136 152 A part extends radially outwardly.Such as from attached drawing clearly, strengthening course 124 setting near apex strip 136 to maximum In the region of width position Pba.Strengthening course 124 contributes to torsional rigidity in face.Strengthening course 124 carries out the operation of deflecting roller fast Speed reaction.The steering stability of pneumatic tire 102 is excellent.

As described above, reference position Paa corresponds to the radial direction on the surface where pneumatic tire 102 and wheel rim Ra are in contact with each other Outer edge.In a part for reference position Paa radially inner sides, pneumatic tire 102 contacts wheel rim Ra.That is, inflated wheel The part in reference position Paa radially inner sides of tire 102 is kept by wheel rim Ra.Meanwhile the one of reference position radial outside In part, pneumatic tire 102 does not contact wheel rim Ra.That is, pneumatic tire 102 in reference position Paa radial outsides A part is detached from wheel rim Ra.In pneumatic tire 102, in the parts Paa of reference position, it is possible to deformation occur and concentrate.

In pneumatic tire 102, the inner end 154 of strengthening course 124 is arranged near the outer end of apex strip 136 152. As described above, the outer end 152 of apex strip 136 is arranged in radial directions in the inside of reference position Paa.Strengthening course 124 It effectively plays a role, to reduce the deformation of the reference position parts Paa of pneumatic tire 102.Strengthening course 124 helps further to carry Torsional rigidity in high face.Strengthening course 124 also allows as deflecting roller is rotated when speed is about 80km/h Acceleration height in the state of enhancing stability (close to the stability in the state of neutral gear).The stable direction of pneumatic tire 102 Property is excellent.

In pneumatic tire 102, using small apex strip 136, and strengthening course 124 is suitably adjusted relative to triangle rubber The position of item 136.The thickness of 112 part of tyre bead can reduce, and thus the weight of pneumatic tire 102 can mitigate.Since it is possible to obtain Torsional rigidity in high face, therefore the steering stability in pneumatic tire 102 is advantageous, although being made using small apex strip 136 Reduce at lateral stiffness.According to the present invention, its weight saving can be obtained and pneumatic tire 102 that steering stability will not reduce.

Fig. 4 shows a part for pneumatic tire 102 shown in Fig. 3.Direction is descended to represent pneumatic tire 102 in fig. 4, the upper Radial direction, left and right directions represents the axial direction of pneumatic tire 102, and the direction vertical with the surface of attached drawing paper, which represents, to be filled The circumferential direction of air filled tyre 102.

In Fig. 4, double-headed arrow Da represent in radial directions slave the outer end of apex strip 136 152 to strengthening course The distance of 124 inner end 154.In the present invention, when the inner end 24 of strengthening course 124 is arranged in radial directions in triangle rubber When the inside of the outer end 152 of item 136, distance Da is represented as negative value.When the inner end 154 of strengthening course 124 is in radial direction On be arranged at the outside of the outer end of apex strip 136 152, distance Da is represented as positive value.

In pneumatic tire 102, distance Da is less than 10mm.In other words, strengthening course 124 inner end 154 setting with The outer end 152 of apex strip 136 is in a radial outward direction at a distance of the radially inner side of the position of 10mm.Therefore, strengthening course 124 Inner end 154 be provided closer to the outer end 152 of apex strip 136.In pneumatic tire 102,124 opposite of strengthening course The help of interior torsional rigidity further enhances.The steering stability of pneumatic tire 102 is excellent.From this view point, distance Da Preferably less or equal to 5mm and more preferably less or equal to 3mm.

In pneumatic tire 102, the position of the inner end 154 of strengthening course 124 is more preferably equal to three in radial directions The outer end 152 of corner rubber strip 136 or the inner end 154 of strengthening course 124 are more preferably disposed in the outer end of apex strip 136 The radially inner side in portion 152.In other words, distance Da is more preferably less or equal to 0mm.Therefore, the inner end of strengthening course 124 154 are configured to the outer end 152 closer to apex strip 136.It is antitorque in 124 opposite of strengthening course in pneumatic tire 102 The help of rigidity further enhances.The steering stability of pneumatic tire 102 is excellent.

In pneumatic tire 102, when the inner end 154 of strengthening course 124 is arranged in radial directions in apex strip 136 When the inside of outer end 152, the position of the inner end 154 of strengthening course 124 is more preferably equal in radial directions and triangle rubber The outer end 152 of item 136 is more preferable at a distance of the inner end 154 of the position of 10mm or strengthening course 124 in a radially inward direction Ground be arranged with the outer end 152 of apex strip 136 in a radially inward direction at a distance of 10mm position radial outside.Change sentence Words say that above-mentioned distance Da is more preferably not less than -10mm.Therefore, influence of the strengthening course 124 to quality effectively reduces.From this From the point of view of angle, distance Da is more preferably not less than -5mm and is particularly preferably not less than -3mm.

In pneumatic tire 102, the proportion of strengthening course 124 greater than or equal to 1.18 and is not higher than 1.28.Clinch 110 Proportion greater than or equal to 1.0 and be not higher than 1.15.Strengthening course 124 has the proportion higher than clinch 110.Strengthening course 124 Influence to the quality of pneumatic tire 102 is more than influence of the clinch 110 to the quality of pneumatic tire 102.

In pneumatic tire 102, the inner end 154 of strengthening course 124 is more preferably arranged in radial directions in triangle rubber Between the outer end 152 of item 136 and the bottom surface 150 of apex strip 136, as shown in the drawing.Therefore, in each strengthening course 124 Inner end 154 radially inner side a part by the crosslinking rubber filling of clinch 110, the crosslinking rubber is to pneumatic tire The influence that 102 quality applies is smaller.In pneumatic tire 102, influence of the strengthening course 124 to quality effectively reduces.

The position of the outer end 156 of strengthening course 124 influences the movement of the reinforcing rib of pneumatic tire 102.The big shifting of reinforcing rib The dynamic rolling resistance for influencing pneumatic tire 102.In pneumatic tire 102, the position of the outer end 156 of strengthening course 124 is preferably It is preferably provided in equal to the maximum width position Pba of tire 102 in the radial direction or the outer end 156 of strengthening course 124 The radially inner side of maximum width position Pba.Therefore, the movement of reinforcing rib can effectively be inhibited.In pneumatic tire 102, resistance is rolled Power can reduce.

In Fig. 4, double-headed arrow Hra represent in radial directions slave the outer end 156 of tyre bead baseline to strengthening course 124 Height.

In pneumatic tire 102, the ratio of height Hra and sectional view height Ha are preferably larger or equal than 0.4.When this ratio When rate is configured to be greater than or equal to 0.4, strengthening course 124 contributes to torsional rigidity in face.Although being made using small apex strip 136 Reduce at lateral stiffness, but the steering stability of pneumatic tire 102 is excellent.From this view point, the ratio is more preferably big In or equal to 0.42, even more preferably greater than or equal to 0.45.

In Fig. 4, double-headed arrow Lra represents the length of strengthening course 124.Length Lra is represented as out of strengthening course 124 The length of its outer end is arrived in end 154.Along the Inner surface measurement length Lra of strengthening course 124.

In pneumatic tire 102, length Lra is preferably larger or equal than 30mm and preferably not more than 80mm.Work as length When degree Lra is configured to be greater than or equal to 30mm, strengthening course 124 contributes to torsional rigidity in face.The steering of pneumatic tire 102 is steady It is qualitative excellent.From this view point, length Lra is more preferably greater than or equal to 40mm, even more preferably greater than or equal to 50mm, particularly preferably be greater than or equal to 60mm.When length Lra is configured to no more than 80mm, strengthening course 124 to quality and The influence of riding comfort can reduce.From this view point, length Lra is more preferably no more than 70mm.

In Fig. 4, double-headed arrow tra represents the thickness of strengthening course 124.Along in the axial direction through apex strip The line measurement thickness tra of 136 outer end 152.

In pneumatic tire 102, thickness tra is preferably larger or equal than 1mm and preferably not more than 3mm.Work as thickness When tra is configured to be greater than or equal to 1mm, strengthening course 124 contributes to torsional rigidity in face.The stable direction of pneumatic tire 102 Property is excellent.When thickness tra is configured to no more than 3mm, influence of the strengthening course 124 to quality can reduce.Pneumatic tire 102 has There is suitable quality, the thus increase of cost and rolling resistance can reduce.

In pneumatic tire 102, as shown in Figures 3 and 4, the part 142 of digging of casingply 138 is clipped in it mainly Between part 140 and strengthening course 124.Therefore, it digs part 142 to be kept, thus applies suitable to casingply 138 Power.Since casingply 138 has high-tension, high steering force is generated in pneumatic tire 102.Pneumatic tire 102 Steering stability is excellent.

For pneumatic tire 102, the component other than strengthening course 124 need not be set come torsional rigidity in the face of improving. In pneumatic tire 102, the quantity of component is less than with the structure for improving torsional rigidity in face other than strengthening course 124 In the tire of part.When the quantity of component is reduced, the quantity on surface where component and another component are engaged with each other subtracts It is few, that is to say, that the quantity of border surface is reduced.Since the quantity of border surface is reduced, the vehicle under operating status When changing track, pneumatic tire 102 deforms more stablely.Smoothly deformation causes stable changing Lane.Pneumatic tire 102 Steering stability is excellent.

When forming strengthening course 124 by multiple components, there are one components and another component to connect each other for the tool of strengthening course 124 Surface where closing, that is to say, that there is border surface.Border surface hinders the vehicle of pneumatic tire 102 under operation It is steadily deformed when changing track.Strengthening course 124 with border surface influences the steering stability of changing Lane.From this angle From the point of view of, each strengthening course 124 is preferably formed by a component.Therefore, the strengthening course 124 of not border surface can be obtained.Reinforcement Layer 124 contributes to pneumatic tire 102 steadily to be deformed in changing Lane.The steering stability of pneumatic tire 102 is excellent.

In pneumatic tire 102, the hardness of strengthening course 124 greater than or equal to 80 and is not higher than 95.When hardness is configured to When greater than or equal to 80, strengthening course 124 contributes to torsional rigidity in face.The steering stability of pneumatic tire 102 is excellent.Work as hardness When being configured to not higher than 95, the rigidity of strengthening course 124 is suitably kept.The riding comfort of pneumatic tire 102 is excellent.

The hardness of strengthening course 124 is measured using the A type hardness testers meter of standard of deferring to " JIS K6253 ".Hardometer is overlayed Cross-sectional surface shown in Fig. 3, to measure hardness.Measurement is executed at a temperature of 23 DEG C.With with the hardness for strengthening course 124 Identical mode measures the hardness of following apex strips 136.

In pneumatic tire 102, the hardness of apex strip 136 greater than or equal to 80 and is not higher than 95.When hardness is set When at greater than or equal to 80, apex strip 136 contributes effectively to pneumatic tire 102 being fixed on wheel rim Ra.Pneumatic tire 102 Steering stability it is excellent.When hardness is configured to not higher than 95, the rigidity of apex strip 136 is suitably kept.Inflated wheel The riding comfort of tire 102 is excellent.

As described above, in pneumatic tire 102, apex strip 136 is formed by crosslinking rubber.Strengthening course 124 is by being crosslinked rubber Glue is formed.From the perspective of productivity, strengthening course 124 is crosslinked preferably as the crosslinking rubber with apex strip 136 Rubber is formed.In other words, apex strip 136 and strengthening course 124 are formed by just crosslinked identical rubber composition.

In pneumatic tire 102, from the perspective of reducing rolling resistance, the loss angle tangent (tan δ) of strengthening course 124 Preferably less or equal to 0.18.Therefore, the heat in strengthening course 124 is reduced.Heat reduces the rolling for causing pneumatic tire 102 Resistance reduces.Therefore, pneumatic tire 102 helps to reduce the fuel consumption of vehicle.From this view point, loss angle tangent is more Preferably less or equal to 0.14.Loss angle tangent is smaller, as a result better.Therefore, the lower limit of loss angle tangent is not limited.

In the present invention, the loss angle tangent that standard " JIS K6394 " measures strengthening course 124 is deferred to.Measuring condition is as follows. Also in a manner of identical with the loss angle tangent for strengthening course 124, the loss angle tangent of following apex strips 136 is measured.

Viscoplasticity frequency spectrograph：" VESF-3 " of Iwamoto Seisakusho

Initial strain：10%

Dynamic strain：± 1%

Frequency：10Hz

Deformation pattern：Tensioning

Measuring temperature：70℃

In pneumatic tire 102, from the perspective of reducing rolling resistance, the loss angle tangent of apex strip 136 is preferred Ground is less than or equal to 0.18.Therefore, the heat in apex strip 136 is reduced.Heat reduction causes the rolling of pneumatic tire 102 to hinder Power reduces.Therefore, pneumatic tire 102 helps to reduce the burnup of vehicle.From this view point, loss angle tangent is more preferably Less than or equal to 0.14.Loss angle tangent is smaller, as a result better.Therefore, the lower limit of loss angle tangent is not limited.

[third embodiment]

Fig. 5 shows the pneumatic tire 202 according to third embodiment.In Figure 5, upper and lower directions represents pneumatic tire 202 Radial direction, left and right directions represents the axial direction of pneumatic tire 202, and the direction vertical with the surface of attached drawing paper, which represents, to be filled The circumferential direction of air filled tyre 202.In Figure 5, the alternate dotted line CLb of length represents the equatorial plane of pneumatic tire 202.In addition to tire Except the decorative pattern of face, the shape of pneumatic tire 202 is symmetrical relative to equatorial plane.

Pneumatic tire 202 is installed on wheel rim Rb.Wheel rim Rb is normal wheel rim.Pneumatic tire 202 is charged air.Inflation The internal pressure of tire 202 is normal internal pressure.

In pneumatic tire 202 on being installed to wheel rim Rb, the part contact wheel rim Rb of pneumatic tire 202.In Fig. 5 In, reference label Pab represents the specific position on the outer surface of pneumatic tire 202.Position Pab, which corresponds to, works as pneumatic tire 202 It is installed on wheel rim Rb and is charged where pneumatic tire 202 and wheel rim Rb when air reaches normal internal pressure be in contact with each other Surface radially outward edge.In the present invention, position Pab is referred to as reference position.

Pneumatic tire 202 includes tyre surface 204, penetrating component 206, a pair of sidewall 208, a pair of of clinch 210, a pair of of tire Circle 212, carcass 214, belt 216, a pair of of edge bandage 218, liner 220, a pair of bead infantees 222,224 and of a pair of of band A pair of of supporting course 226.Pneumatic tire 202 is tubeless type.Pneumatic tire 202 is installed in passenger car.

In Figure 5, reference mark Pbb represents the specific position on the inner surface of pneumatic tire 202.At the Pbb of position, fill Air filled tyre 202 has the axial maximum width showed on the profile of inner surface.In pneumatic tire 202, the left side at the Pba of position The length on axial direction between side surface and right lateral surface (outer surface on sidewall 208) is represented as pneumatic tire 202 Maximum width (also referred to as section view width).In the present invention, position Pbb is the position that pneumatic tire 202 has maximum width.

Tyre surface 204 has the shape extended radially out.Tyre surface 204 forms the tread surface 228 that can contact road surface. Fluted 230 are formed in tyre surface 204.Tread contour is formed by groove 230.Tyre surface 204 includes base layer 232 and crown layer 234.Crown layer 234 is arranged in radial directions in the outside of base layer 232.Crown layer 234 is laminated in 232 top of base layer. Base layer 232 is formed by the excellent crosslinking rubber of adhesiveness.The typical substrates rubber of base layer 232 is natural rubber.Crown layer 234 are formed by the excellent crosslinking rubber of abrasion resistance, heat resistance and grip performance.

Penetrating component 206 penetrates tyre surface 204.One end of penetrating component 206 is exposed in tread surface 228.It penetrates Another end of part 206 contacts belt 216.Penetrating component 206 extends in circumferential direction.In other words, penetration portion It is cricoid to divide 206.Pneumatic tire 202 may include multiple penetrating components 206, these penetrating components 206 do not form ring-type Shape and separated from one another in circumferential direction.Penetrating component 206 is formed by conduction crosslinking rubber.

Sidewall 208 almost extends internally from the end of tyre surface 204 in radial directions respectively.The radial outside on sidewall 208 Part engaging tread 204.The radial inside portion on sidewall 208 engages clinch 210.Sidewall 208 is by cut resistant and weatherability Excellent crosslinking rubber is formed.Sidewall 208 prevents carcass 214 impaired.

Clinch 210 almost extends internally from the end on sidewall 208 in radial directions respectively.Clinch 210 exists It is arranged on axial direction in the outside of tyre surface 212 and carcass 214.Clinch 210 is formed by the crosslinking rubber of excellent in abrasion resistance. Clinch 210 contacts the flange F b of wheel rim Rb.

Tyre bead 212 is separately positioned on the inside of clinch 210 in the axial direction.Clinch 210 is in radial direction On almost extend internally from the end on sidewall 208.Therefore, tyre bead 212 is arranged in radial directions in the inside on sidewall 208.Respectively Tyre bead 212 includes core 236 and apex strip 238.Core 236 is annular shape, including non-stretchable coiling.The typical material of coiling Material is steel.Apex strip 238 is arranged in radial directions in the outside of core 236.Apex strip 238 is in radial directions from core 236 extend outwardly.Apex strip 238 is radially outward tapered.Apex strip 238 is formed by high rigidity crosslinking rubber.Triangle Adhesive tape 238 is also referred to as the first apex strip.

In pneumatic tire 202, apex strip 238 is formed by just crosslinked rubber composition.Rubber composition Preferred substrate rubber is dience rubber.The specific example of dience rubber include natural rubber (NR), polyisoprene (IR), Polybutadiene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).Can be used in combination two or more types The rubber of type.

The rubber composition of apex strip 238 includes reinforcing agent.Reinforcing agent is typically carbon black.Usable such as FEF, GPF, The carbon black of HAF, ISAF and SAF.From the perspective of the intensity of apex strip 238, the base rubber of every 100 parts (by weight) The amount of carbon black be preferably larger or equal than 5 parts (by weight).From the perspective of the flexibility of apex strip 238, carbon black Amount is preferably not more than 50 parts (by weight).From the perspective of heat is reduced caused by deformation, the supplement as carbon black Or substitute, silica can be used.In this case, dry silica and wet silica can be used.

As one sees fit, crosslinking agent is added into the rubber composition of apex strip 238, softening agent, stearic acid, zinc oxide, is resisted Oxidant, wax, cure activating ingredient etc..

Carcass 214 includes a casingply 240.Casingply 240 is overlapped along tyre surface 104, sidewall 208 and tire The inside in portion 210 extends on the tyre bead 212 of both sides and between tyre bead 212.Casingply 240 in the axial direction from It is dug towards outside around each core 236 inside.It is dug by this, casingply 240 includes major part 242 and digs portion Divide 244.The structure of carcass 214 is referred to as " 1-0 structures ".Carcass 214 may include two or more casingplies 240.

Such as from Fig. 5 clearly, the end 246 for digging part 244 is arranged in the maximum width position of pneumatic tire 202 The radial outside of Pbb.Part 244 is dug to mainly help from maximum width position Pbb to the core 236 in pneumatic tire 202 Rigidity in region.It wherein digs the end 246 of part 244 therefore the tire in the radial outside of maximum width position Pbb is set The structure of body 214 is also referred to as height and digs (HTU) structure.Carcass 214 can be configured to so that dig the end 246 of part 244 It is arranged near above-mentioned reference position Pab.The structure of carcass 214 with this structure is referred to as low digging (LTU) structure. In this case, influence of the carcass 214 to quality reduces.Low (LTU) structure of digging helps to mitigate the weight of pneumatic tire 202 Amount.

In Figure 5, solid line BBLb represents tyre bead baseline.Tyre bead baseline is to limit the wheel for being equipped with pneumatic tire 202 thereon The line of the rim diameter (referring to JATMA) of rim Rb.Tyre bead baseline extends in the axial direction.Double-headed arrow Hwb is represented in radial direction On direction slave tyre bead baseline to the height of maximum width position Pbb.Double-headed arrow Hcb represents slave tyre bead in radial directions Height of the baseline to the end 246 for digging part 244.

In pneumatic tire 202, when carcass 214 has HTU structures, the ratio of height Hcb and height Hwb are more than or wait In 1.1 and be not more than 1.3.When carcass 214 has LTU structures, which is greater than or equal to 0.2 and is not more than 0.4.

Casingply 240 includes multiple cords and rubberizing rubber aligned with each other.Each cord is relative to equatorial plane The absolute value of angle is 75 ° to 90 °.In other words, carcass 214 forms radial structure.Cord is formed by organic fiber.Organic fibre The preferable example of dimension includes polyester fiber, nylon fiber, rayon fiber, polyethylene naphthalate fiber and aromatics polyamides Amine fiber.

Belt 216 is arranged in radial directions in the inside of tyre surface 204.Belt 216 is laminated in 214 top of carcass. Belt 216 reinforces carcass 214.Belt 216 includes internal layer 248 and outer layer 250.Such as from Fig. 5 clearly, in the axial direction On, the width of internal layer 248 is slightly larger than the width of outer layer 250.Each of internal layer 248 and outer layer 250 include aligned with each other more A cord and unshowned rubberizing rubber.Each cord is tilted relative to equatorial plane.The absolute value at inclination angle is typically larger than or waits In 10 ° and it is not more than 35 °.The cord of internal layer 248 is relative to the inclined direction of equatorial plane and the cord of outer layer 250 relative to red The inclined direction of road plane is opposite.The preferred material of cord is steel.Organic fiber can be used for cord.Belt 216 is in axial side Upward width is preferably larger or equal than 0.7 times of the maximum width of pneumatic tire 202.Belt 216 may include three or More layers.

The radial outside in belt 216 is arranged in edge bandage 218, respectively near the end of belt 216.Each side Edge bandage 218 includes cord and unshowned rubberizing rubber.Cord is by spiral winding.Edge bandage 218 has so-called Non junction structure.Cord substantially extends in circumferential direction.Cord with respect to the circumferential direction direction angle be less than or equal to 5 °, more It is preferably less than or equal to 2 °.The end of belt 216 is kept by cord, and belt 216 is forbidden to be lifted as a result,.Cord by Organic fiber is formed.The preferable example of organic fiber includes nylon fiber, polyester fiber, rayon fiber, poly- naphthalenedicarboxylic acid second Terephthalate fibers and aramid fibre.

The setting of liner 220 is in 214 inside of carcass.Liner 220 engages the inner surface of carcass 214.Liner 220 is excellent by air-tightness Different crosslinking rubber is formed.The typical substrates rubber of liner 220 is butyl rubber or halogenated isobutylene-isoamyl Diene rubber.Liner 220 keeps the internal pressure of pneumatic tire 202.

Chafer 222 is separately positioned near tyre bead 212.When pneumatic tire 202 is installed on wheel rim Rb, tire It encloses infantees 222 and contacts wheel rim Rb.By the contact, some parts near tyre bead 212 are protected.In the present embodiment, Chafer 222 is formed by fabric and the rubber padded in the fabric.Chafer 222 can form one with clinch 210. In this case, the material identical of the material of chafer 222 and clinch 210.

The outside for being separately positioned on apex strip 238 in radial directions with 224.Such as from attached drawing clearly, band 224 exists It is arranged on axial direction in the outside of major part 242.With 224, digging in casingply 240 is set in the axial direction The inside of part 244.In pneumatic tire 202, band 224 is separately positioned on major part 242 and digs between part 244.It changes Word says, band 224 is clipped in major part 242 and digs between part 244 respectively.

In pneumatic tire 202, band 224 is formed by just crosslinked rubber composition.The preferred base of rubber composition Body rubber is dience rubber.The specific example of dience rubber includes natural rubber (NR), polyisoprene (IR), polybutadiene Alkene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).The rubber for two or more types that can be used in combination Glue.

Reinforcing agent is preferably included with 224 rubber composition.Reinforcing agent is typically carbon black.Usable such as FEF, GPF, The carbon black of HAF, ISAF and SAF.From the perspective of the intensity of band 224, the carbon black of the base rubber of every 100 parts (by weight) Amount be preferably larger or equal than 5 parts (by weight).From the perspective of the flexibility of band 224, the amount of carbon black is preferably little In 50 parts (by weight).From the perspective of heat is reduced caused by deformation, as the supplement or alternative of carbon black, it can be used Silica.In this case, dry silica and wet silica can be used.

As one sees fit, into the rubber composition of band 224 add crosslinking agent, softening agent, stearic acid, zinc oxide, antioxidant, Wax, cure activating ingredient etc..

Supporting course 226 is separately positioned on the outside of band 224 in the axial direction.As described above, in pneumatic tire 202, There is carcass 214 high lifting structure, band 224 to be arranged in the axial direction in the inside for digging part 244.It is clear such as from attached drawing , in pneumatic tire 202, in the radial outside for digging part 244, supporting course 226, which is laminated in, digs 244 top of part.Branch Hold layer 226 in radial directions along dig part 244 extend.When carcass 214 has above-mentioned low lifting structure, respectively dig The end 246 of part 244 is arranged near the Pab of reference position.Therefore, in this case, in the radial outside of band 224, branch It holds layer 226 and is laminated in 224 top of band.In this case, supporting course 226 extends along band 224 in radial directions.Supporting course 226 are also known as the second apex strip.

In pneumatic tire 202, supporting course 226 is formed by just crosslinked rubber composition.Rubber composition it is excellent It is dience rubber to select base rubber.The specific example of dience rubber includes natural rubber (NR), polyisoprene (IR), gathers Butadiene (BR), acrylonitrile-butadiene copolymer (NBR) and polychloroprene (CR).Can be used in combination two or more types Rubber.

The rubber composition of supporting course 226 preferably includes reinforcing agent.Reinforcing agent is typically carbon black.Usable such as FEF, The carbon black of GPF, HAF, ISAF and SAF.From the perspective of the intensity of supporting course 226, the matrix rubber of every 100 parts (by weight) The amount of the carbon black of glue is preferably larger or equal than 5 parts (by weight).From the perspective of the flexibility of supporting course 226, carbon black Amount is preferably not more than 50 parts (by weight).From the perspective of heat is reduced caused by deformation, the supplement as carbon black Or substitute, silica can be used.In this case, dry silica and wet silica can be used.

As one sees fit, crosslinking agent, softening agent, stearic acid, zinc oxide, antioxygen are added into the rubber composition of supporting course 226 Agent, wax, cure activating ingredient etc..

In Figure 5, double-headed arrow Lab represents the length of apex strip 238.Length Lab is represented as from apex strip 238 Bottom surface center (the reference mark Pcb in Fig. 5) in the radial direction arrive its outer end 252 length.

In pneumatic tire 202, it is inside that the diameter in above-mentioned reference position Pab is arranged in the outer end 252 of apex strip 238 Side.In pneumatic tire 202, the length of apex strip 238 is less than the length of traditional triangle adhesive tape.Use small apex strip 238 Allow to design 212 part of tyre bead with small thickness.Apex strip 238 contributes to the weight saving of pneumatic tire 202.Separately Outside, small apex strip 238 allows casingply 240 to have suitable profile (also referred to as shell line).Specifically, vertical In on the sectional view of the circumferential direction of pneumatic tire 202, the profile of casingply 240 is similar to the week with pneumatic tire 202 Single camber line on the sectional view vertical to direction.The profile allows that deformation is forbidden to concentrate.Small apex strip 238, which additionally aids, to be carried High-durability.In addition, since casingply 240 has suitable profile, in pneumatic tire 202,208 part of sidewall Overall deformation.208 part of sidewall is forbidden to deform in a specific way, the entirety of 208 part of sidewall contributes to pneumatic tire as a result, 202 rigidity.The profile of casingply 240 contributes to the steering stability of pneumatic tire 202.From this view point, three The length Lab of corner rubber strip 238 is preferably less or equal to 15mm.In pneumatic tire 202, length Lab is preferably no less than 5mm.Length Lab, which is configured to the apex strip 238 not less than 5mm, contributes to the rigidity of 212 part of tyre bead.With suitable for size Apex strip 238 allow to avoid production pneumatic tire 202 to have any problem.

In pneumatic tire 202, each band 224 is in the radial direction in a part for the radial outside of apex strip 238 Extend along the major part 242 of casingply 240.Such as from attached drawing clearly, the setting of each band 224 is from apex strip To in the region of maximum width position Pbb near 238.Band 224 contributes to torsional rigidity in face.In pneumatic tire 202, to the greatest extent Pipe causes lateral stiffness to reduce using small apex strip 238, but the rapid reaction of the operation to deflecting roller.Pneumatic tire 202 Steering stability is excellent.

Position with 224 outer end 254 influences the movement of the reinforcing rib of pneumatic tire 202.The big mobile shadow of reinforcing rib Ring the rolling resistance of pneumatic tire 202.In pneumatic tire 202, the position of the outer end 254 of band 224 is preferably equivalent to radial direction The maximum width position Pbb of tire 202 on direction or the outer end 254 of band 224 are preferably provided in maximum width position The radially inner side of Pbb.Therefore, the movement of reinforcing rib can effectively be inhibited.In pneumatic tire 202, rolling resistance can reduce.At this In invention, when the distance between the maximum width position Pbb of the outer end of band 224 254 and pneumatic tire 202 is less than or equal to When 1mm, the position of the outer end 254 of band 224 is defined as the maximum width position Pbb equal to pneumatic tire 202.

In Figure 5, double-headed arrow Lsb represents the length of band 224.Length Lsb is represented as the inner end 256 from band 224 To the length of its outer end 254.Length Lsb is measured along band 224.Double-headed arrow Hsb represents slave tyre bead in radial directions Height of the baseline to the outer end 254 of band 224.

In pneumatic tire 202, length Lsb is preferably larger or equal than 30mm and preferably not more than 70mm.Work as length When degree Lsb is configured to be greater than or equal to 30mm, band 224 contributes to torsional rigidity in face.The steering stability of pneumatic tire 202 It is excellent.From this view point, length Lsb is preferably larger or equal than 40m.When length Lsb is configured to no more than 70mm, Influence with 224 pairs of quality and riding comfort reduces.From this view point, length Lsb is preferably not more than 60m.

In pneumatic tire 202, the ratio of above-mentioned height Hsb and height Hwb are preferably larger or equal than 0.5.Therefore, Band 224 contributes to torsional rigidity in face.The steering stability of pneumatic tire 202 is excellent.From this view point, the ratio is more excellent Selection of land is greater than or equal to 0.6.As described above, from the perspective of rolling resistance, the position of the outer end 254 of band 224 is in radial direction The outer end 254 of the maximum width position Pbb or band 224 that are preferably equivalent to pneumatic tire 202 on direction are preferably provided in The radially inner side of the maximum width position Pbb of pneumatic tire 202.Therefore, which is preferably not more than 1.

In a part for reference position Pab radially inner sides, pneumatic tire 202 contacts wheel rim Rb.That is, inflated wheel The part in reference position Pab radially inner sides of tire 202 is kept by wheel rim Rb.Meanwhile in reference position Pab radial outsides In a part, pneumatic tire 202 does not contact wheel rim Rb.That is, pneumatic tire 202 in reference position Pab radial outsides A part be detached from wheel rim Rb.In pneumatic tire 202, in the parts Pab of reference position, it is possible to deformation occur and concentrate.

In pneumatic tire 202, supporting course 226 is in a part for the radial outside of band 224 in radial directions from ginseng It examines and almost extends outwardly near the Pab of position.The outer end 258 of supporting course 226 is arranged in radial directions in reference position Pab Outside.Supporting course 226 plays a role, to forbid the parts reference position Pab of pneumatic tire 202 to deform.Supporting course 226 helps In resisting rigidity in face.Supporting course 226 also allows as deflecting roller is rotated when speed is about 80km/h Acceleration height in the state of enhancing stability (close to the stability in the state of neutral gear).Supporting course 226 contributes to further Improve steering stability.

As described above, in pneumatic tire 202, small apex strip 238 helps to mitigate the weight of pneumatic tire 202.Band 224 and supporting course 226 allow torsional rigidity in raising face, be thus conducive to steering stability.According to the present invention, it is improved Steering stability inhibits the increased pneumatic tire of quality 202 simultaneously.

In Figure 5, double-headed arrow Lrb represents the inner end 260 slave supporting course 226 in radial directions to its outer end 258 length.In the present invention, length Lrb is the length of supporting course 226.

In pneumatic tire 202, length Lrb is preferably larger or equal than 10mm and preferably not more than 50mm.Work as length When degree Lrb is configured to be greater than or equal to 10mm, supporting course 226 contributes to torsional rigidity in face.The steering of pneumatic tire 202 is steady It is qualitative excellent.From this view point, length Lrb is preferably larger or equal than 20m.When length Lrb is configured to be not more than When 50mm, influence of the supporting course 226 to quality and riding comfort reduces.From this view point, length Lrb is preferably little In 40mm.

Fig. 6 shows a part for pneumatic tire 202 shown in Fig. 5.In figure 6, upper and lower directions represents pneumatic tire 202 Radial direction, left and right directions represents the axial direction of pneumatic tire 202, and the direction vertical with the surface of attached drawing paper, which represents, to be filled The circumferential direction of air filled tyre 202.In figure 6, double-headed arrow Hbb represents the slave tyre bead baseline (reality in Fig. 6 in radial directions Line BBLb) arrive reference position Pab height.The range of height Hbb is typically 20mm to 25mm.

In figure 6, double-headed arrow Dab represents 226 inner end from reference position Pab to supporting course in radial directions 260 distance.In the present invention, when the inner end 260 of supporting course 226 is arranged in radial directions in the Pab of reference position When side, distance Dab is represented as negative value.When the inner end 260 of supporting course 226 is arranged in radial directions in reference position Pab Outside when, distance Dab is represented as positive value.

In pneumatic tire 202, distance Dab is preferably less or equal to 10mm.Therefore, the inner end 260 of supporting course 226 It is provided closer to reference position Pab.In pneumatic tire 202, the help of torsional rigidity is further in 226 opposite of supporting course Enhancing.The steering stability of pneumatic tire 202 is excellent.

In pneumatic tire 202, the position of the inner end 260 of supporting course 226 is more preferably equal to joined in radial directions The inner end 260 for examining position Pab or supporting course 226 is more preferably disposed in the radially inner side of reference position Pab.In other words It says, distance Dab is more preferably less or equal to 0mm.Therefore, supporting course 226 effectively plays a role, to reduce pneumatic tire 202 The reference position parts Pab deformation.In pneumatic tire 202, steering stability is further increased.Confront from supporting course 226 From the perspective of the influence of amount, distance Dab is preferably no less than -10mm.In the present invention, when the inner end 260 of supporting course 226 When the distance between reference position Pab is less than or equal to 1mm, the position of the inner end 260 of supporting course 226 is defined as being equal to Reference position Pab.

As described above, from the perspective of steering stability, distance Dab is preferably less or equal to 10mm, it is highly preferred that Less than or equal to 0mm.From the perspective of mitigating weight, distance Dab is preferably no less than -10mm.That is, in inflated wheel In tire 202, from steering stability and from the perspective of mitigating weight, supporting course 226 is preferably provided to so that each supporting course 226 inner end 260 be arranged from radial inwardly direction with reference position Pab at a distance of the position of 10mm to radially outward direction Upper and reference position Pab is in the region of the position of 10mm.From the perspective of further increasing steering stability, supporting course 226 be more preferably configured so that each supporting course 226 inner end 260 setting from radial inwardly direction with reference bit Pab is set in the position of 10mm to the region of reference position Pab.

In figure 6, double-headed arrow Dbb represents 226 outer end from reference position Pab to supporting course in radial directions 258 distance.

In pneumatic tire 202, distance Dbb is preferably larger or equal than 10mm and preferably not more than 40mm.Change sentence Words say that supporting course 226 is preferably provided to so that the outer end 258 of each supporting course 226 is arranged from radially outward direction With reference position Pab on the position to radially outward direction of 10mm with reference position Pab at a distance of the region of the position of 40mm In.When distance Dbb is configured to be greater than or equal to 10mm, supporting course 226 contributes effectively to torsional rigidity in face.Inflated wheel The steering stability of tire 202 is excellent.When distance Dbb is configured to no more than 40mm, influence of the supporting course 226 to quality subtracts It is small.Influence to rigidity also reduces, and excellent riding comfort is thus kept in pneumatic tire 202.

In figure 6, double-headed arrow tsb represents the thickness of band 224.Double-headed arrow trb represents the thickness of supporting course 226.It is thick Degree tsb and thickness trb is each represented as maximum gauge.

In pneumatic tire 202, thickness tsb is preferably larger or equal than 0.5mm and preferably not more than 2mm.Work as thickness When degree tsb is configured to be greater than or equal to 0.5mm, band 224 contributes to torsional rigidity in face.The stable direction of pneumatic tire 202 Property is excellent.When thickness tsb is configured to no more than 2mm, influence of the band 224 to quality can reduce.Since pneumatic tire 202 has There is suitable quality, therefore the increase of cost and rolling resistance can reduce.

In pneumatic tire 202, thickness trb is preferably larger or equal than 1mm and preferably not more than 2mm.Work as thickness When trb is configured to be greater than or equal to 1mm, supporting course 226 contributes to torsional rigidity in face.The stable direction of pneumatic tire 202 Property is excellent.When thickness trb is configured to no more than 2mm, influence of the supporting course 226 to quality reduces.Due to pneumatic tire 202 Increase with suitable quality, therefore cost and rolling resistance can reduce.

In pneumatic tire 202, as shwon in Figures 5 and 6, casingply 240 digs part 244 preferably respectively It is clipped between band 224 and supporting course 226.Therefore, it digs part 244 to be kept, it is suitable thus to apply to casingply 240 Tension.Since casingply 240 has high-tension, high steering force is generated in pneumatic tire 202.Pneumatic tire 202 Steering stability it is excellent.When carcass 214 has LTU structures in pneumatic tire 202, the end 246 for digging part 244 can It is clipped in respectively between band 224 and supporting course 226.Therefore, same effect can be obtained.

When pneumatic tire 202 deforms, the inboard portion of 208 part of sidewall of pneumatic tire 202 is compressed, and outside it Side section is affected, is extended.In pneumatic tire 202, band 224 is arranged in the axial direction in the inside for digging part 244.Cause This, the conventional tire compared to no band 224 digs part, digs part 244 and is arranged in axially outer portion.It is inflating In tire 202, is generated in digging part 244 and dig the high tension of the tension that is generated in part than conventional tire.In it Generating the part 244 of digging of high-tension contributes to the rigidity of pneumatic tire 202.The steering stability of pneumatic tire 202 is excellent.

In pneumatic tire 202, the hardness of supporting course 226 is preferably higher than or is equal to 80 and preferably no higher than 95. When hardness is set above or is equal to 80, supporting course 226 contributes to torsional rigidity in face.The steering of pneumatic tire 202 is steady It is qualitative excellent.When hardness is configured to not higher than 95, the rigidity of supporting course 226 is suitably kept.The seating of pneumatic tire 202 Comfort level is excellent.

The hardness of supporting course 226 is measured using the A type hardness testers meter of standard of deferring to " JIS K6253 ".Hardometer is overlayed Cross-sectional surface shown in Fig. 5, to measure hardness.Measurement is executed at a temperature of 23 DEG C.With the hardness phase with needle supporting course 226 Same mode, measures hardness in each of following bands 224 and apex strip 238.

In pneumatic tire 202, the hardness of band 224 is preferably higher than or is equal to 80 and preferably no higher than 95.When hard When degree is set above or is equal to 80, band 224 contributes to torsional rigidity in face.The steering stability of pneumatic tire 202 is excellent. When hardness is configured to not higher than 95, the rigidity of band 224 is suitably kept.The riding comfort of pneumatic tire 202 is excellent.

In pneumatic tire 202, the hardness of apex strip 238 is preferably higher than or equal to 80 and preferably no higher than 95.When hardness is set above or is equal to 80, apex strip 238 contributes effectively to pneumatic tire 202 being fixed on wheel Rim Rb.The steering stability of pneumatic tire 202 is excellent.When hardness is configured to not higher than 95, apex strip is suitably kept 238 rigidity.The riding comfort of pneumatic tire 202 is excellent.

As described above, in pneumatic tire 202, apex strip 238 is formed by crosslinking rubber.Band 224 is by crosslinking rubber shape At.Supporting course 226 is formed by crosslinking rubber.From the perspective of productivity, band 224 is preferably by the friendship with apex strip 238 Crosslinking rubber is formed as connection rubber.From the point of view of same angle, supporting course 226 is preferably by the crosslinking with apex strip 238 Rubber is crosslinked as rubber to be formed.It is particularly preferred that band 224 and supporting course 226 are by the crosslinking rubber with apex strip 238 Similar crosslinking rubber is formed, that is to say, that forms apex strip 238,224 and of band by just crosslinked identical rubber composition Supporting course 226.

In pneumatic tire 202, from the perspective of reducing rolling resistance, the loss angle tangent (tan δ) of supporting course 226 Preferably less or equal to 0.18.Therefore, the heat in supporting course 226 is reduced.Heat reduces the rolling for causing pneumatic tire 202 Resistance reduces.Therefore, pneumatic tire 202 helps to reduce the fuel consumption of vehicle.From this view point, loss angle tangent is more Preferably less or equal to 0.14.Loss angle tangent is smaller, as a result better.Therefore, the lower limit of loss angle tangent is not limited.

In the present invention, the loss angle tangent that standard " JIS K6394 " measures supporting course 226 is deferred to.Measuring condition is as follows. Also in a manner of identical with the loss angle tangent for supporting course 226, the loss of following band 224 and apex strip 238 is measured Angle tangent.

Viscoplasticity frequency spectrograph：" VESF-3 " of Iwamoto Seisakusho

Initial strain：10%

Dynamic strain：± 1%

Frequency：10Hz

Deformation pattern：Tensioning

Measuring temperature：70℃

In pneumatic tire 202, from the perspective of reducing rolling resistance, the loss angle tangent of band 224 is preferably less than Or it is equal to 0.18.Therefore, the heat in band 224 is reduced.Heat reduction causes the rolling resistance of pneumatic tire 202 to reduce.Therefore, Pneumatic tire 202 helps to reduce the fuel consumption of vehicle.From this view point, loss angle tangent is even more preferably less than or waits In 0.14.Loss angle tangent is smaller, as a result better.Therefore, the lower limit of loss angle tangent is not limited.

In pneumatic tire 202, from the perspective of reducing rolling resistance, the loss angle tangent of apex strip 238 is preferred Ground is less than or equal to 0.18.Therefore, the heat in apex strip 238 is reduced.Heat reduction causes the rolling of pneumatic tire 202 to hinder Power reduces.Therefore, pneumatic tire 202 helps to reduce the fuel consumption of vehicle.From this view point, loss angle tangent is more excellent Selection of land is less than or equal to 0.14.Loss angle tangent is smaller, as a result better.Therefore, the lower limit of loss angle tangent is not limited.

The preferred embodiment of the present invention has as subsegment falls the feature described in [1] to [19].

[1] a kind of pneumatic tire, the pneumatic tire include：Tyre surface, the tyre surface have the outer surface for forming tread surface；One To sidewall, the sidewall almost extends internally from the end of the tyre surface respectively in radial directions；A pair of of clinch, it is described Clinch almost extends internally from the end on the sidewall respectively in the radial direction described；A pair of bead, the tyre bead exist The inside of the clinch is separately positioned on axial direction；Carcass, the carcass is along in the tyre surface and the sidewall Extend on another in one and the tyre bead of the side in the tyre bead and between the two tyre beads；And it is a pair of Band, the band almost extend outwardly from the tyre bead along the carcass respectively in the radial direction described, wherein

The tyre bead includes：Core；First apex strip, first apex strip it is described in the radial direction from the core to Outer extension；And second apex strip, second apex strip are arranged on the axial direction in first apex strip Outside,

The carcass includes casingply,

The casingply is dug on the axial direction from inside towards outside around the core, and the tire Body casing ply includes major part and what is formed by digging the casingply dig part,

The part of digging is arranged between first apex strip and second apex strip, and described digs Part contacts the major part in the part of the radial outside of the outer end of first apex strip,

The outer end of second apex strip is arranged described on the outside of the end for digging part in the radial direction,

The position of the outer end of each band it is described in the radial direction be equal to the pneumatic tire have maximum width where The diameter that the position where having the maximum width in the pneumatic tire is arranged in position or the outer end of each band is inside Side, and

The complex elastic-modulus of each band is greater than or equal to 60MPa and is not higher than 70MPa.

[2] pneumatic tire according to above-mentioned [1], wherein the length of each first apex strip be greater than or equal to 5mm and No more than 15mm.

[3] pneumatic tire according to above-mentioned [1] or [2], wherein from the outer end of each first apex strip to described The length for digging the end that the correspondence in part digs part is greater than or equal to 10mm.

[4] pneumatic tire according to any one of above-mentioned [1] to [3], the pneumatic tire include：

A pair of bead infantees, the chafer is on the axial direction respectively from inside towards outside around the tire Circle is dug, wherein

One end of each chafer is arranged on the axial direction digs portion in the correspondence dug in part Point and the clinch in correspondence clinch between,

It is greater than or equal to 5mm to the height of one end of each chafer from tyre bead baseline and is not more than 22mm, And

When the pneumatic tire is installed on wheel rim, the chafer contacts the wheel rim.

[5] pneumatic tire according to any one of above-mentioned [1] to [4], wherein the band it is described in the radial direction Extend outwardly from the outer end of second apex strip along the major part.

[6] a kind of pneumatic tire, the pneumatic tire include：Tyre surface；A pair of sidewall；A pair of bead；Carcass；And a pair of of benefit Strong layer, wherein

The sidewall almost extends internally from the end of the tyre surface respectively in radial directions,

The tyre bead in the inside for being separately positioned on the sidewall in the radial direction,

The carcass is along in the inside on the tyre surface and the sidewall one in the tyre bead and the tyre bead Extend on another and between the two tyre beads,

The strengthening course is arranged in the axial direction in the outside of the carcass,

The tyre bead include core and described in the radial direction respectively from the outwardly extending apex strip of the core,

The strengthening course is described in the radial direction along the carcass from the portion near the outer end of the apex strip Divide and extend outwardly, and each strengthening course is tapered from the inside points of the strengthening course outward in the radial direction described,

When reference position is defined as the following position on the outer surface of the pneumatic tire, outside the apex strip Each of end is arranged in the radial direction described in the inside of the reference position, wherein the position corresponds to when described Pneumatic tire, which is installed on wheel rim and is filled with air, reaches when normal internal pressure the pneumatic tire and the wheel rim each other The radially outward edge of the contact surface of contact, and

The inner end of each strengthening course be arranged with the outer end of the corresponding apex strip in the apex strip radial direction to At a distance of the inside of the position of 10mm in outside direction.

[7] pneumatic tire according to above-mentioned [6], wherein the position of the outer end of each strengthening course is in the radial direction side Being equal to the pneumatic tire upwards, there is the outer end setting of position or each strengthening course where when maximum width to be filled described The radially inner side of the position where when air filled tyre is with the maximum width.

[8] pneumatic tire according to above-mentioned [6] or [7], wherein it is described in the radial direction slave tyre bead baseline to The height of the outer end of each strengthening course is greater than or equal to 0.4 relative to the ratio of the cross section height of the pneumatic tire.

[9] pneumatic tire according to any one of above-mentioned [6] to [8], wherein the position of the inner end of each strengthening course Inner end in the outer end or each strengthening course for being equal to the correspondence apex strip in the apex strip in the radial direction The radially inner side of the outer end for the correspondence apex strip being arranged in the apex strip.

[10] pneumatic tire according to above-mentioned [9], wherein when the inner end of each strengthening course is arranged in the triangle rubber When the radially inner side of the outer end of the correspondence apex strip in item, the position of the inner end of each strengthening course it is described in the radial direction Equal to the outer end with the apex strip in radial inwardly direction at a distance of the position of 10mm or the inner end of the strengthening course Be arranged with the outer end of the apex strip in a radially inward direction at a distance of 10mm the position radial outside.

[11] pneumatic tire according to any one of above-mentioned [6] to [10], wherein the thickness of each strengthening course be more than or Equal to 1mm and it is not more than 3mm.

[12] pneumatic tire according to any one of above-mentioned [6] to [11], wherein the length of each strengthening course be more than or Equal to 60mm and it is not more than 80mm.

[13] a kind of pneumatic tire, the pneumatic tire include：Tyre surface；A pair of sidewall；A pair of of clinch；A pair of bead； Carcass；A pair of of band；And a pair of of supporting course, wherein

The clinch almost extends internally from the end on the sidewall respectively in the radial direction described,

The tyre bead is separately positioned on the inside of the clinch in the axial direction,

The tyre bead includes core and in the apex strip being arranged in the radial direction in the outside of the core,

The carcass includes casingply, the casingply on the axial direction from inside towards outside around It the core to dig, and the casingply includes major part and formed by digging the casingply Part is dug,

The band respectively in the part of the radial outside of the apex strip described in the radial direction along the master Partly to extend,

The supporting course is separately positioned on the outside of the band on the axial direction, and

When reference position is defined as the following position on the outer surface of the pneumatic tire, the outer end of each apex strip Portion is arranged in the radial direction described in the inside of the reference position, wherein the position corresponds to when the pneumatic tire is pacified It is attached on wheel rim and is filled with the contact that the pneumatic tire is in contact with each other with the wheel rim when air reaches normal internal pressure The radially outward edge on surface, and

Each supporting course almost extends outwardly from the part near the reference position in the radial direction described.

[14] pneumatic tire according to above-mentioned [13], wherein it is described in the radial direction from the reference position Distance to the inner end of the correspondence supporting course in the supporting course is less than or equal to 10mm.

[15] pneumatic tire according to above-mentioned [14], wherein the position of the inner end of each supporting course is in the radial direction It is equal to the reference position on direction or the radially inner side in the reference position is arranged in the inner end of each supporting course.

[16] pneumatic tire according to any one of above-mentioned [13] to [15], wherein the length of each supporting course is more than Or equal to 20mm and it is not more than 40mm.

[17] pneumatic tire according to any one of above-mentioned [13] to [16], wherein the thickness of each supporting course is more than Or equal to 1mm and it is not more than 2mm.

[18] pneumatic tire according to any one of above-mentioned [13] to [17], wherein the position of the outer end of each band It is arranged in the outer end of position or each band where described be equal in the radial direction when the pneumatic tire has maximum width The radially inner side of the position where when the pneumatic tire has the maximum width.

[19] pneumatic tire according to any one of above-mentioned [13] to [18], wherein the part of digging is set respectively It sets between the band and the supporting course.

Embodiment

Hereinafter, according to embodiment, effect of the invention will be apparent.However, based on the description to embodiment, do not answer This restrictively explains the present invention.

[experiment 1]

[embodiment 1]

Obtain the pneumatic tire of the embodiment 1 with the specification indicated in basic structure and following table 1 shown in Fig. 1. The size of pneumatic tire is 195/65R15.The first apex strip, the second triangle are formed by just crosslinked identical rubber composition Adhesive tape and band.

[comparative example 1 to 3]

In the same manner as example 1, the tire of comparative example 1 to 3 is obtained, unlike, it is not provided with the two or three Corner rubber strip and band and length L1, height Hc and length Lp are as indicated by following Table 1.Comparative example 1 represents conventional wheel Tire.

[comparative example 4]

In the same manner as example 1, the tire of comparative example 4 is obtained, unlike, it is not provided with band.

[comparative example 5]

In the same manner as example 1, the tire of comparative example 5 is obtained, unlike, it is not provided with the second triangle rubber Item.

[embodiment 2 and comparative example 6 to 7]

In the same manner as example 1, the tire of embodiment 2 and comparative example 6 to 7 is obtained, unlike, it is used for band Rubber composition be different and elastic modulus E s is as indicated by following Table 2.

[embodiment 3 to 5 and comparative example 8]

In the same manner as example 1, the tire of embodiment 3 to 5 and comparative example 8 is obtained, unlike, the length of band Degree Ls is different and ratio (Hs/Hb) is as indicated by following Table 3.

[embodiment 6 to 8]

In the same manner as example 1, the tire of embodiment 6 to 8 is obtained, unlike, it is used for the first triangle rubber The rubber composition of item, the rubber composition for the second apex strip, the rubber composition for band are different, and bullet Property modulus E1, elastic modulus E 2 and elastic modulus E s are as indicated by following Table 4.In each of embodiment 6 to 8 In, the first apex strip, the second apex strip and band are formed by just crosslinked identical rubber composition.

[embodiment 9 to 12]

In the same manner as example 1, the tire of embodiment 9 to 12 is obtained, unlike, the first apex strip Length L1 is as indicated by following Table 5.

[embodiment 13 to 17]

In the same manner as example 1, obtain the tire of embodiment 13 to 17, unlike, height Hc be such as with Under it is indicated in table 6.

[embodiment 18 to 21]

In the same manner as example 1, obtain the tire of embodiment 18 to 21, unlike, length Lp be such as with Under it is indicated in table 7.

[torsional rigidity and steering force in measuring surface]

Using six component force measuring device of flat banding pattern tire under following measuring condition in measuring surface torsional rigidity and turn Xiang Li.

Used wheel rim：6.0JJ

Internal pressure：210kPa

Load：2.55kN

Speed：80km/h

Camber angle：0°

Side drift angle：1.0°

Hereinafter, indicating given value in table 1 to table 7, wherein torsional rigidity and steering force in the face of the tire of comparative example 1 In each of value be 100.These values are bigger, and torsional rigidity and steering force are higher in face.

[evaluation lateral stiffness]

The lateral stiffness constant of each tire is measured under the following conditions.

Used wheel rim：6.0JJ

Internal pressure：210kPa

Load：4.24kN

Hereinafter, indicating given value in table 1 to table 7, wherein the value of the lateral stiffness constant of the tire of comparative example 1 is 100.Value is bigger, and lateral stiffness is higher.

[steering stability and riding comfort]

Each tire is installed on 6.0JJ wheel rims, and is filled with air, reaches the internal pressure of 210kPa.Tire is pacified It is attached to the passenger car that engine displacement is 1800cc.It allows driver to drive passenger car on racing car circuit and evaluates stable direction Property and riding comfort.When evaluating steering stability, check close in the state of N (neutral gear) stability, change track The stability of stability and the steering (DRY steerings) on dry runway.These results are indicated as following in table 1 to table 7 Given value.Value is bigger, and evaluation is better.

[durability]

Each tire is installed on normal wheel rim, and is filled with air, reaches the internal pressure of 250kPa.Tire is installed To cylinder type tire testing machine, apply the vertical load of 8.15kN to tire.It executes tire in the cylinder with 1.7m radiuses On run with the speed of 100km/h.Range ability of measurement until finding that tire is impaired.These results are instructed to following Given value in the case where for the value of comparative example being 100 the following table 1 to table 7.Value is bigger, and evaluation is better.

[quality]

Measure the quality of a tire.Table of these results in the case where the following value for being indicated as comparative example 1 is 100 Given value in 1 to table 7.Be worth it is smaller, evaluation it is better.

[noise]

Each tire is installed on the wheel rim that size is 6.0JJ, and is filled with air, reaches the internal pressure of 210kPa. Tire is installed to the passenger car that engine displacement is 1800cc.Make passenger car on the pitch road surfaces with high roughness with The speed of 60km/h is run.By sound collecting microphone come making an uproar under 100Hz frequency bands at operating seat during measuring operation Sound size (dB).Given value of measured value the case where the following value for being indicated as comparative example is 100 in the following table 1 to table 7.Value is got over Small, road noise is smaller.

[table 1]

1 evaluation result of table

[table 2]

2 evaluation result of table

[table 3]

3 evaluation result of table

[table 4]

4 evaluation result of table

[table 5]

5 evaluation result of table

[table 6]

6 evaluation result of table

[table 7]

7 evaluation result of table

As indicated in table 1 to table 7, compared to the tire in comparative example, evaluation in the tire of these embodiments compared with It is high.It is preferable that the present invention, which is explicitly indicated, in evaluation result.

[experiment 2]

[embodiment 1a]

Produce tire shown in Fig. 3 to Fig. 4.The size of tire is 195/65R15.The hardness of apex strip is 85.It mends The hardness of strong layer is 85.In embodiment 1a, apex strip and strengthening course are formed by identical rubber composition.In radial side The upward height Haa slave tyre bead baseline to reference position Paa is 22mm.

[comparative example 1a]

Comparative example 1a represents conventional tire.In comparative example 1a, using traditional triangle adhesive tape (length=35mm), and not Strengthening course is set.

[comparative example 2a]

In a manner of identical with embodiment 1a, the tire of comparative example 2a is obtained, unlike, it is not provided with strengthening course.

[embodiment 2a to 3a]

In a manner of identical with embodiment 1a, the tire of embodiment 2a to 3a is obtained, unlike, the thickness of strengthening course Tra is indicated in table 8 as follows.

[embodiment 4a to 10a]

In a manner of identical with embodiment 1a, the tire of embodiment 4a to 10a is obtained, unlike, adjust strengthening course Length Lra and ratio (Hra/Ha) indicated in table 9 as follows.In embodiment 9a, the position etc. of the outer end of strengthening course In maximum width position Pba in the radial direction.In embodiment 10a, the outer end of strengthening course is arranged in maximum width position The radial outside of Pba.

[embodiment 11a to 15a and comparative example 3a]

In a manner of identical with embodiment 1a, the tire of embodiment 11a to 15a and comparative example 3a are obtained, unlike, The length Lra and distance Da for adjusting strengthening course are indicated in table 10 as follows.

[torsional rigidity and steering force in measuring surface]

Used wheel rim：6.0JJ

Internal pressure：210kPa

Load：2.55kN

Speed：80km/h

Camber angle：0°

Side drift angle：1.0°

Hereinafter, indicating given value in table 8 to table 10, wherein torsional rigidity and steering in the face of the tire of comparative example 1a Value in each of power is 100.These values are bigger, and torsional rigidity and steering force are higher in face.

[evaluation lateral stiffness]

Used wheel rim：6.0JJ

Internal pressure：210kPa

Load：4.24kN

Hereinafter, indicating given value in table 8 to table 10, wherein the value of the lateral stiffness constant of the tire of comparative example 1a is 100.Value is bigger, and lateral stiffness is higher.

[rolling resistance]

Using rolling resistance machine device rolling resistance is measured under following measuring condition.

Used wheel rim：6.0JJ (is made) of aluminium alloy

Internal pressure：210kPa

Load：4.82kN

Speed：80km/h

Given value in table 8 to table 10 of these results in the case where the following value for being indicated as comparative example 1a is 100. Be worth it is smaller, evaluation it is better.

[quality]

Measure the quality of a tire.These results are in the case where the following value for being indicated as comparative example 1a is 100 Given value in table 8 to table 10.Be worth it is smaller, evaluation it is better.

[steering stability and riding comfort]

Each tire is installed on 6.0JJ wheel rims, and is filled with air, reaches the internal pressure of 210kPa.Tire is pacified It is attached to the passenger car that engine displacement is 1800cc.It allows driver to drive passenger car on racing car circuit and evaluates stable direction Property and riding comfort.When evaluating steering stability, check close in the state of N (neutral gear) stability, change track The stability of stability and the steering (DRY steerings) on dry runway.These results are indicated as following in table 8 to table 10 Given value.Value is bigger, and evaluation is better.

[table 8]

8 evaluation result of table

[table 9]

9 evaluation result of table

[table 10]

10 evaluation result of table

As indicated in table 8 to table 10, compared to the tire in comparative example, evaluation in the tire of these embodiments compared with It is high.It is preferable that the present invention, which is explicitly indicated, in evaluation result.

[experiment 3]

[embodiment 1b]

Fig. 5 is produced to tire shown in Fig. 6.The size of tire is 195/65R15." structure of carcass " in table 11 " HTU " instruction carcass in grid has " height is dug " structure.Part setting is dug in " Y " instruction in the unit of " sandwich " Between band and supporting course.In embodiment 1b, apex strip, band and supporting course are formed by identical rubber composition.Band Length Lsb be 50mm.The thickness tsb of band is 1.0mm.In radial directions slave tyre bead baseline to the height of reference position Pab It is 22mm to spend Hbb.

[comparative example 1b]

Comparative example 1b represents conventional tire.In comparative example 1b, using traditional triangle adhesive tape (length=35mm), and do not have There are setting band and supporting course.

[comparative example 2b]

In a manner of identical with embodiment 1b, the tire of comparative example 2b is obtained, unlike, it is not provided with supporting course.

[embodiment 2b to 4b]

In a manner of identical with embodiment 1b, the tire of embodiment 2b to 4b is obtained, unlike, the thickness of supporting course Trb is indicated in table 11 as follows.

[embodiment 5b to 11b and embodiment 13b]

In a manner of identical with embodiment 1b, the tire of embodiment 5b to 11b and embodiment 13b are obtained, unlike, Length Lrb, distance Dab and distance Dbb are indicated in table 12 and table 13 as follows.

[embodiment 12b]

In a manner of identical with embodiment 1b, the tire of embodiment 12b is obtained, unlike, distance Dab and distance Dbb is indicated in table 13 as follows.

[embodiment 14b]

In a manner of identical with embodiment 1b, the tire of embodiment 14b is obtained, unlike, the structure of carcass is low Lifting structure." LTU " instruction carcass in the unit of " structure of carcass " in table 14 has " low to dig " structure.

[embodiment 15b to 17b]

In a manner of identical with embodiment 1b, the tire of embodiment 15b to 17b is obtained, unlike, the structure of carcass It is low lifting structure, length Lrb, distance Dab and distance Dbb are indicated in table 14 as follows.In embodiment 17b, part is dug It is not located between band and supporting course." N " in the unit of " sandwich " such as in table 14 indicate this state.

[embodiment 18b to 21b]

In a manner of identical with embodiment 1b, the tire of embodiment 18b to 21b is obtained, unlike, the rubber of supporting course Glue mixture is different and its hardness indicates in table 15 as follows.Apex strip and band are similar to the triangle in embodiment 1b Adhesive tape and band.

[embodiment 22b to 24b]

In a manner of identical with embodiment 1b, the tire of embodiment 22b to 24b is obtained, unlike, apex strip Length Lab is indicated in table 16 as follows.

[rolling resistance]

Used wheel rim：6.0JJ (is made) of aluminium alloy

Internal pressure：210kPa

Load：4.82kN

Speed：80km/h

It is given in table 11 to table 16 of these results in the case where the following value for being indicated as comparative example 1b is 100 Value.Be worth it is smaller, evaluation it is better.

[quality]

Measure the quality of a tire.These results are in the case where the following value for being indicated as comparative example 1b is 100 Given value in table 11 to table 16.Be worth it is smaller, evaluation it is better.

[steering stability and riding comfort]

Each tire is installed on 6.0JJ wheel rims, and is filled with air, reaches the internal pressure of 210kPa.Tire is pacified It is attached to the passenger car that engine displacement is 1800cc.It allows driver to drive passenger car on racing car circuit and evaluates stable direction Property and riding comfort.When evaluating steering stability, check close in the state of N (neutral gear) stability, change track The stability of stability and the steering on dry runway.These results are in the following given value being indicated as in table 11 to table 16. Value is bigger, and evaluation is better.

[table 11]

11 evaluation result of table

[table 12]

12 evaluation result of table

[table 13]

13 evaluation result of table

[table 14]

14 evaluation result of table

[table 15]

15 evaluation result of table

[table 16]

16 evaluation result of table

As indicated in table 11 to table 16, compared to the tire in comparative example, the evaluation in the tire of these embodiments It is higher.It is preferable that the present invention, which is explicitly indicated, in evaluation result.

Industrial applicibility

Above-mentioned pneumatic tire applies also for the various vehicles.

Description to reference mark

2,102,202 ... tire

4,104,204 ... tyre surface

8,108,208 ... sidewall

10,110,210 ... clinch

12,112,212 ... tyre bead

14,114,214 ... carcass

24,224 ... bands

26,126,228 ... tread surface

34,134,236 ... core

36 ... first apex strips

38 ... second apex strips

The outer end of 40 ... second apex strips 38

The outer end of 42 ... first apex strips 36

44,138,240 ... casingply

46,140,242 ... major part

48,142,244 ... part is dug

50 ... dig the end of part 48

The outer end of 52 ... clinch 10

The inner end of 54 ... second apex strips 38

One end of 60 ... chafers 22

The outer end of 64 ... bands 24

124 ... strengthening courses

136,238 ... apex strips

144 ... dig the end of part 142

The bottom surface of 150 ... apex strips 136

The outer end of 152 ... apex strips 136

The inner end of 154 ... strengthening courses 124

The outer end of 156 ... strengthening courses 124

226 ... supporting courses

246 ... dig the end of part 244

The outer end of 252 ... apex strips 238

The outer end of 254 ... bands 224

The inner end of 256 ... bands 224

The outer end of 258 ... supporting courses 226

The inner end of 260 ... supporting courses 226

Claims

1. a kind of pneumatic tire, the pneumatic tire include：

Tyre surface, the tyre surface have the outer surface for forming tread surface；

A pair of sidewall, the sidewall extend internally from the end of the tyre surface respectively in radial directions；

A pair of of clinch, the clinch extend internally from the end on the sidewall respectively in the radial direction described；

A pair of bead, the tyre bead are separately positioned on the inside of the clinch in the axial direction；

Carcass, the carcass is along another in the inside on the tyre surface and the sidewall one in the tyre bead and the tyre bead Extend on one and between the two tyre beads；And

A pair of of band, the band extend outwardly from the tyre bead along the carcass respectively in the radial direction described, wherein

The tyre bead includes：Core；First apex strip, first apex strip is described in the radial direction from the core to extension It stretches；And second apex strip, second apex strip are arranged on the axial direction in the outer of first apex strip Side,

The carcass includes casingply,

The casingply is dug on the axial direction from inside towards outside around the core, and the carcass Layer of cloth includes major part and what is formed by digging the casingply dig part,

The part of digging is arranged between first apex strip and second apex strip, and described digs part The major part is contacted in the part of the radial outside of the outer end of first apex strip,

The position of the outer end of each band is in the position where described be equal in the radial direction when the pneumatic tire has maximum width Set or the outer end of each band be arranged the pneumatic tire have the maximum width when where the position diameter it is inside Side, and

The complex elastic-modulus of each band is greater than or equal to 60MPa and is not higher than 70MPa,

The band is extended radially outwards from second apex strip,

The band is formed by orthogonal rubber composition.

2. pneumatic tire according to claim 1, wherein the length of each first apex strip is greater than or equal to 5mm and not More than 15mm.

3. pneumatic tire according to claim 1 or 2, wherein dug from the outer end of each first apex strip to described The length that correspondence in part digs the end of part is greater than or equal to 10mm.

4. pneumatic tire according to claim 1 or 2, the pneumatic tire include：

A pair of bead infantees, the chafer are turned over from inside towards outside around the tyre bead respectively on the axial direction It rises, wherein

One end of each chafer be arranged on the axial direction the correspondence dug in part dig part and Between correspondence clinch in the clinch,

5. pneumatic tire according to claim 1 or 2, wherein the band is described in the radial direction along described main Part extends outwardly from the outer end of second apex strip.